Podcast
Questions and Answers
What are the zeros of the quadratic function $f(x) = 3x^2 + 11x - 4$?
What are the zeros of the quadratic function $f(x) = 3x^2 + 11x - 4$?
- $x = 4$ and $x = -\frac{1}{3}$
- $x = -4$ and $x = \frac{1}{3}$ (correct)
- $x = 4$ and $x = \frac{1}{3}$
- $x = -4$ and $x = -\frac{1}{3}$
What are the x-intercepts of the graph of the equation $y = 4x^2 - 9$?
What are the x-intercepts of the graph of the equation $y = 4x^2 - 9$?
- $-\frac{4}{9}$ and $\frac{4}{9}$
- $-\frac{9}{4}$ and $\frac{9}{4}$
- $-\frac{3}{2}$ and $\frac{3}{2}$ (correct)
- $-\frac{2}{3}$ and $\frac{2}{3}$
Which statement best describes the relationship between any pair of x- and y-values that satisfy the equation $y - 2 = x^2$?
Which statement best describes the relationship between any pair of x- and y-values that satisfy the equation $y - 2 = x^2$?
- The value of x is more than the square root of y.
- The value of y is more than the square of x. (correct)
- The value of x is less than the square root of y.
- The value of y is less than the square of x.
Suppose Clare and Lin throw stones into a lake. To determine whose stone hit the water first, what information is needed?
Suppose Clare and Lin throw stones into a lake. To determine whose stone hit the water first, what information is needed?
Consider the quadratic equation $y = a(x - b)(x - c)$. Which statement about the equation is always true?
Consider the quadratic equation $y = a(x - b)(x - c)$. Which statement about the equation is always true?
Consider the expression $-2x^2 - 3x + 4$. Which statement about this expression is true?
Consider the expression $-2x^2 - 3x + 4$. Which statement about this expression is true?
Clare’s stone reached its maximum height 1.4 seconds after it was tossed. Without additional information, what can NOT be determined?
Clare’s stone reached its maximum height 1.4 seconds after it was tossed. Without additional information, what can NOT be determined?
Which of the following functions has a minimum value of -4?
Which of the following functions has a minimum value of -4?
Clare's stone is tossed and its height can be modeled over time. If you knew the maximum height of Clare's stone, what can you determine?
Clare's stone is tossed and its height can be modeled over time. If you knew the maximum height of Clare's stone, what can you determine?
Jessica was asked to find the minimum value of the quadratic expression $2x^2 - 12x + 17$ by completing the square. What is the minimum value?
Jessica was asked to find the minimum value of the quadratic expression $2x^2 - 12x + 17$ by completing the square. What is the minimum value?
Suppose Clare's stone was released and achieved a maximum height. What additional piece of information can help calculate the time when Clare’s stone hit the water?
Suppose Clare's stone was released and achieved a maximum height. What additional piece of information can help calculate the time when Clare’s stone hit the water?
The distance, d, a car travels at a speed, s, for a time, t, is given by $d = st$. If the speed increases linearly with time, described by $s = 2t + 5$, what type of function describes the distance traveled as a function of time?
The distance, d, a car travels at a speed, s, for a time, t, is given by $d = st$. If the speed increases linearly with time, described by $s = 2t + 5$, what type of function describes the distance traveled as a function of time?
A company's profit, P, is modeled by $P(x) = -x^2 + 10x - 9$, where x is the number of units sold. What sales level, x, maximizes the company's profit?
A company's profit, P, is modeled by $P(x) = -x^2 + 10x - 9$, where x is the number of units sold. What sales level, x, maximizes the company's profit?
Given the data table with x and f(x) values, which statement best describes the behavior of f(x) as x increases from 0 to 4?
Given the data table with x and f(x) values, which statement best describes the behavior of f(x) as x increases from 0 to 4?
Given the quadratic function $g(x) = (x + 4)^2 + 7$, what effect does shifting the graph 6 units down have on the vertex?
Given the quadratic function $g(x) = (x + 4)^2 + 7$, what effect does shifting the graph 6 units down have on the vertex?
If a parabola has an x-intercept of -4 and a y-intercept of 16, which quadratic function could represent this parabola?
If a parabola has an x-intercept of -4 and a y-intercept of 16, which quadratic function could represent this parabola?
Which characteristic is consistent with a graph of a quadratic function that has a minimum point located at (-3, 3)?
Which characteristic is consistent with a graph of a quadratic function that has a minimum point located at (-3, 3)?
Which statement accurately interprets the graph of the function $f(x) = 0.2(x^2 - 4x - 5)$?
Which statement accurately interprets the graph of the function $f(x) = 0.2(x^2 - 4x - 5)$?
A scientist models phosphorous levels in soil using a function where the input is depth in feet. If 'x' represents the depth below the surface, which domain is most appropriate for this model, assuming the scientist only measures up to 5 feet deep?
A scientist models phosphorous levels in soil using a function where the input is depth in feet. If 'x' represents the depth below the surface, which domain is most appropriate for this model, assuming the scientist only measures up to 5 feet deep?
If a chief financial officer uses a function to model the projected net profit based on the number of proposed stores (up to 11), what is the most likely practical domain for this function?
If a chief financial officer uses a function to model the projected net profit based on the number of proposed stores (up to 11), what is the most likely practical domain for this function?
Consider a quadratic function modeling profit based that is based on the number of items sold. What does the vertex of the function represent in this context?
Consider a quadratic function modeling profit based that is based on the number of items sold. What does the vertex of the function represent in this context?
Jessica attempted to complete the square for the expression $2x^2 - 12x + 17$. Her steps are shown below:
Step 1: $2(x^2 - 6x) + 17$
Step 2: $2(x^2 - 6x + 9 - 9) + 17$
Step 3: $2(x^2 - 6x + 9) - 9 + 17$
Step 4: $2(x - 3)^2 + 8$
Her teacher told her that one of her steps was wrong. Identify the incorrect step and explain why it is incorrect.
Jessica attempted to complete the square for the expression $2x^2 - 12x + 17$. Her steps are shown below:
Step 1: $2(x^2 - 6x) + 17$ Step 2: $2(x^2 - 6x + 9 - 9) + 17$ Step 3: $2(x^2 - 6x + 9) - 9 + 17$ Step 4: $2(x - 3)^2 + 8$
Her teacher told her that one of her steps was wrong. Identify the incorrect step and explain why it is incorrect.
Trevor wants to prove the polynomial identity that begins as $(x + a)(x + b)$. What is the final form of this polynomial after the binomials are multiplied and simplified?
Trevor wants to prove the polynomial identity that begins as $(x + a)(x + b)$. What is the final form of this polynomial after the binomials are multiplied and simplified?
Which of the following equations correctly represents the process of completing the square for the equation $x^2 + 6x = 7$?
Which of the following equations correctly represents the process of completing the square for the equation $x^2 + 6x = 7$?
Consider the equation $x^2 - 12x = -20$. After completing the square, which of the following represents the solution(s) for x?
Consider the equation $x^2 - 12x = -20$. After completing the square, which of the following represents the solution(s) for x?
Solve $9x^2 + 12x + 5 = 10$ by completing the square. Which of the following represents the correct solution(s) for x?
Solve $9x^2 + 12x + 5 = 10$ by completing the square. Which of the following represents the correct solution(s) for x?
A theater's weekly profit, $P$, from a comedy show depends on the ticket price, $t$. The equation relating profit and ticket price is not fully provided, but suppose the theater wants to determine the ticket prices at which they would earn $1,500 in profit. Which general approach should they take?
A theater's weekly profit, $P$, from a comedy show depends on the ticket price, $t$. The equation relating profit and ticket price is not fully provided, but suppose the theater wants to determine the ticket prices at which they would earn $1,500 in profit. Which general approach should they take?
Consider the equation $x + 6 = x^2$. To solve this equation. Which of the following is the correct next step?
Consider the equation $x + 6 = x^2$. To solve this equation. Which of the following is the correct next step?
If $f(x) = 4x^2 - 3x + 7$, what is the value of $f(-2)$?
If $f(x) = 4x^2 - 3x + 7$, what is the value of $f(-2)$?
Given a function's graph, where the plotted line exists between x = -1 and x = 11 inclusive, but only for real number values, what is the domain of the function?
Given a function's graph, where the plotted line exists between x = -1 and x = 11 inclusive, but only for real number values, what is the domain of the function?
A ball is launched upwards from an 80-foot building. The trajectory is modeled by a function. Considering the physical constraints, what is the most appropriate domain for this function?
A ball is launched upwards from an 80-foot building. The trajectory is modeled by a function. Considering the physical constraints, what is the most appropriate domain for this function?
A diver jumps from a 10-foot board, with height modeled by $h = t^2 - 8t + 10$. What is the minimum height the diver reaches?
A diver jumps from a 10-foot board, with height modeled by $h = t^2 - 8t + 10$. What is the minimum height the diver reaches?
The height of a baseball is given by $h(t) = -16t^2 + 80t + 3$. How long does it take for the ball to reach its maximum height?
The height of a baseball is given by $h(t) = -16t^2 + 80t + 3$. How long does it take for the ball to reach its maximum height?
Which graph represents the equation $y = x^2 + 4x - 5$?
Which graph represents the equation $y = x^2 + 4x - 5$?
What is the equation of the quadratic function that passes through the points (0, −1), (1, 0), and (2, −3)?
What is the equation of the quadratic function that passes through the points (0, −1), (1, 0), and (2, −3)?
Which of the following describes a city population that is increasing as a linear function of time?
Which of the following describes a city population that is increasing as a linear function of time?
Identify the situation that demonstrates a non-linear population change over time.
Identify the situation that demonstrates a non-linear population change over time.
Flashcards
Equation: y - 2 = x
Equation: y - 2 = x
The value of y is more than the square of x.
Quadratic Equation: y = a(x − b)(x − c)
Quadratic Equation: y = a(x − b)(x − c)
b and c determine the roots of the quadratic equation.
Expression: −2x^2 − 3x + 4
Expression: −2x^2 − 3x + 4
There is a real number that represents the maximum value of the expression.
Which quadratic function could the graph represent?
Which quadratic function could the graph represent?
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Vertex Form of a Quadratic Equation
Vertex Form of a Quadratic Equation
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Completing the Square
Completing the Square
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Completing the Square technique
Completing the Square technique
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Coefficient Distribution
Coefficient Distribution
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Polynomial Identity (x + a)(x + b)
Polynomial Identity (x + a)(x + b)
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Isolating Squared Term
Isolating Squared Term
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Square Root Both Sides
Square Root Both Sides
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Maximum Profit
Maximum Profit
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Evaluating a Function
Evaluating a Function
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Tennis Ball Height
Tennis Ball Height
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Minimum Point of a Quadratic Function
Minimum Point of a Quadratic Function
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Maximum Point of a Quadratic Function
Maximum Point of a Quadratic Function
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Vertex of a Parabola
Vertex of a Parabola
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Domain of a Function
Domain of a Function
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X-intercept
X-intercept
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Y-intercept
Y-intercept
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Quadratic Function
Quadratic Function
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Vertical Shift
Vertical Shift
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Minimum/Maximum Height
Minimum/Maximum Height
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Time to Max Height
Time to Max Height
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Linear Function
Linear Function
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Equation from Points
Equation from Points
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Linear increase over time.
Linear increase over time.
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Real Numbers
Real Numbers
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Linear Relationship
Linear Relationship
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Zeros of a Quadratic Function
Zeros of a Quadratic Function
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Maximum Height
Maximum Height
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Time of Impact
Time of Impact
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Time to Maximum Height
Time to Maximum Height
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Comparing Impact times
Comparing Impact times
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Comparing maximum heights
Comparing maximum heights
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Study Notes
- The equation relating two variables is y - 2 = x².
Analyzing the Equation
- Solutions to y - 2 = x² involve a specific relationship between x and y.
- For any valid pair of x and y values, y will always be more or equal to the square of x.
Quadratic Equations
- A quadratic equation may be expressed as y = a(x – b)(x – c).
- 'b' and 'c' determine the roots of the quadratic equation.
Quadratic Expressions
- For the expression -2x² - 3x + 4.
- A real number exists that represents the maximum value of the expression.
Graph of a Quadratic Function
- A quadratic function graph
f
has points (2,0) and (6,0) as x-intercepts and a vertex at (4,-4). - The equation f(x) = (x – 2)(x – 6) is a possible definition for the function f.
- The equation f(x) = (x - 4)² - 4 also defines the function
f
. - The equation f(x) = x² - 8x + 12 defines the function
f
.
Projectile Height Equation
- The height of a projectile equation is y = -16x² + 32x - 24, where y is height in feet and x is time in seconds.
- Rewriting this equation in vertex form gives: y= -16(x-1)² -8.
Completing the Square
- Jessica needs to find the minimum value of the quadratic expression 2x² - 12x + 17 by completing the square.
- Step 3 is incorrect because -9 needs to be multiplied by 2 when factored out of the parentheses.
Polynomial Identities
- Trevor aims to prove the polynomial identity that begins with (x + a)(x + b).
- The final form of this polynomial, after multiplying the binomials equals x² + (a + b)x + ab.
Equivalent Equations
- Equations equivalent to x² + 6x = 16:
- x² + 6x - 16 = 0
- x² + 6x + 9 = 25
- (x + 3)² = 25
Solving Quadratic Equations
- To solve 4x² – 5x – 6 = 0, factorize or apply the quadratic formula
Solving Equations by Completing the Square
- To solve x² - 12x = -20 by completing the square, complete these steps to find X
- To solve 9x² + 12x + 5 = 10, transform to 9x² + 12x - 5 = 0 and solve for x
Profit Modeling
- A community theater models profit with p(d) = -4d² + 200d - 100, where p(d) is profit and d is ticket price.
Graphing Parabolas
- Mark graphs a parabola with x-intercept -4 and y-intercept 16 which is described by the equation f(x) = x² + 8x + 16.
Quadratic Functions with minimum Points
- For a quadratic function with a minimum point of (-3,3), the graph opens upwards and has its vertex at (-3,3).
Representing Functions Graphically
- The function best described by f(x) = 0.2(x² - 4x - 5) is a parabola opening upwards.
Scientist Study
- A scientist is studying phosphorus levels in soil.
- 2 feet below the surface corresponds to -2 feet in the graph.
- The domain for the function is 0≤x≤9, using real numbers as it relates to the scientists study.
Domain of a Function Graph
- A chief financial officer presents a function graph showing projected company net profit based on number of stores.
- For this function, the domain consists of integer numbers from 1 to 11.
Projectile Trajectory
- A ball is launched upwards at an 80 foot building.
- For this function, the domain consists of only rational nnumbers.
- The domain of this functions ranges from 0 to 5 seconds.
Diver Height
- A diver jumps from a board 10 feet above water with height
h
at timet
given by h = t² - 8t + 10. - The minimum height is -6 feet.
Batted Baseball Height
- The height of a batted baseball,
h(t)
in feet, aftert
seconds is given by h(t) = −16t² + 80t + 3. - It takes 2.5 seconds fo the ball to reach its maximum height after it has been hit.
Graph Representations
- The equation y = x² + 4x - 5 is best represented by a u-shaped graph.
- In this graph, the vertex is located at (-2,-9).
Quadratic Function Equations
- The equation of the quadratic function passing through (0, -1), (1, 0), and (2, -3) is y = -2x² + 3x - 1​.
Linear Population Growth
- In a city with increasing population as a linear function of time, the population gains 1,500 each year.
Linear Relationships in Tables
- The table demonstrating a linear relationship between time and length is Time (years) / Length (inches): 0/40, 1/43, 2/46, 3/49, 4/52, 5/55. The length increases consitently by 3 inches per year.
Quadratic Function Forms
- For f (x) = x² - 8x - 4, the expression that also defines and best reveals a maximum or minimum is 2 (x - 4)² - 20.
Zeroes of Quadratic Functions
- For f(x) = 3x² + 11x - 4, the zeroes of the quadratic function occur at x = -4 and x = ⅓.
X-Intercepts of Quadratic Functions
- For y = 4x²-9, the x-intercepts of the graph occur at - 3/2 and 3/2.
Comparing Stone Trajectories
- Lin and Clare threw stones in the air; Clare’s stone height is defined by f(t) = (−16t − 8)(t − 1), while Lin's is represented on a graph.
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