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Questions and Answers

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 $y = 4x^2 - 9$?

  • $-\frac{4}{9}$ 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 $y - 2 = x^2$?

  • 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?

<p>The time each stone hit the water. (D)</p> Signup and view all the answers

Consider the quadratic equation $y = a(x - b)(x - c)$. Which statement about the equation is always true?

<p>b and c determine the roots (A)</p> Signup and view all the answers

Consider the expression $-2x^2 - 3x + 4$. Which statement about this expression is true?

<p>There is a real number that represents the maximum value of the expression. (C)</p> Signup and view all the answers

Clare’s stone reached its maximum height 1.4 seconds after it was tossed. Without additional information, what can NOT be determined?

<p>Whether Lin's stone hit the water before Clare's stone. (D)</p> Signup and view all the answers

Which of the following functions has a minimum value of -4?

<p>$f (x) = (x - 4)^2 - 4$ (D)</p> Signup and view all the answers

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?

<p>Whether Clare's stone reached a higher maximum than Lin's stone. (B)</p> Signup and view all the answers

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?

<p>-1 (D)</p> Signup and view all the answers

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?

<p>Initial upward velocity of the stone. (C)</p> Signup and view all the answers

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?

<p>Quadratic (A)</p> Signup and view all the answers

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?

<p>x = 5 (A)</p> Signup and view all the answers

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?

<p>f(x) increases quadratically. (D)</p> Signup and view all the answers

Given the quadratic function $g(x) = (x + 4)^2 + 7$, what effect does shifting the graph 6 units down have on the vertex?

<p>The y-coordinate of the vertex decreases by 6. (D)</p> Signup and view all the answers

If a parabola has an x-intercept of -4 and a y-intercept of 16, which quadratic function could represent this parabola?

<p>$f(x) = x^2 + 8x + 16$ (A)</p> Signup and view all the answers

Which characteristic is consistent with a graph of a quadratic function that has a minimum point located at (-3, 3)?

<p>The range is $y \geq 3$. (B)</p> Signup and view all the answers

Which statement accurately interprets the graph of the function $f(x) = 0.2(x^2 - 4x - 5)$?

<p>The graph opens upwards and has x-intercepts at -1 and 5. (D)</p> Signup and view all the answers

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?

<p>$0 \leq x \leq 5$, where x is a real number (A)</p> Signup and view all the answers

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?

<p>Integers from 0 to 11 inclusive. (C)</p> Signup and view all the answers

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?

<p>The sales quantity that maximizes profit. (B)</p> Signup and view all the answers

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.

<p>Step 3 is incorrect because -9 needs to be multiplied by 2 when it is taken out of the parentheses. (B)</p> Signup and view all the answers

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?

<p>$x^2 + (a + b)x + ab$ (D)</p> Signup and view all the answers

Which of the following equations correctly represents the process of completing the square for the equation $x^2 + 6x = 7$?

<p>$x^2 + 6x + 9 = 16$ (A)</p> Signup and view all the answers

Consider the equation $x^2 - 12x = -20$. After completing the square, which of the following represents the solution(s) for x?

<p>x = 2 or x = 10 (C)</p> Signup and view all the answers

Solve $9x^2 + 12x + 5 = 10$ by completing the square. Which of the following represents the correct solution(s) for x?

<p>$x = \frac{-2 \pm \sqrt{1}}{3}$ (B)</p> Signup and view all the answers

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?

<p>Solve the equation $P(t) = 1500$ to find the ticket prices that yield $1,500 profit. (C)</p> Signup and view all the answers

Consider the equation $x + 6 = x^2$. To solve this equation. Which of the following is the correct next step?

<p>Subtract x and 6 from both sides to set the equation to zero. (B)</p> Signup and view all the answers

If $f(x) = 4x^2 - 3x + 7$, what is the value of $f(-2)$?

<p>29 (D)</p> Signup and view all the answers

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?

<p>Real numbers from –1 to 11 (B)</p> Signup and view all the answers

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?

<p>All real numbers from 0 to 5 (C)</p> Signup and view all the answers

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?

<p>–6 feet (B)</p> Signup and view all the answers

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?

<p>2.5 seconds (C)</p> Signup and view all the answers

Which graph represents the equation $y = x^2 + 4x - 5$?

<p>Graph A [Image of parabola opening upwards with vertex in quadrant III] (D)</p> Signup and view all the answers

What is the equation of the quadratic function that passes through the points (0, −1), (1, 0), and (2, −3)?

<p>$y = -2x^2 + 3x - 1$ (B)</p> Signup and view all the answers

Which of the following describes a city population that is increasing as a linear function of time?

<p>Each year, a city population increases by 1,500. (D)</p> Signup and view all the answers

Identify the situation that demonstrates a non-linear population change over time.

<p>A city's population increases by 10% each year. (C)</p> Signup and view all the answers

Flashcards

Equation: y - 2 = x

The value of y is more than the square of x.

Quadratic Equation: y = a(x − b)(x − c)

b and c determine the roots of the quadratic equation.

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?

Opens downwards and has roots at x = 2 and x = 6. Roots given in the form (x-2)(x-6)

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Vertex Form of a Quadratic Equation

A quadratic equation rewritten in vertex form, y = a(x − h)^2 + k, where (h, k) is the vertex.

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Completing the Square

Process used to rewrite a quadratic expression into vertex form.

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Completing the Square technique

Isolating the squared variable term and adding/subtracting a constant to create a perfect square trinomial.

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Coefficient Distribution

In the process of completing the square, when moving a constant term from within parentheses that are being multiplied by a coefficient, remember to multiply the constant by that coefficient.

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Polynomial Identity (x + a)(x + b)

Polynomial identity (x + a)(x + b) expands to x² + (a + b)x + ab.

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Isolating Squared Term

After completing the square, isolate the squared term on one side of the equation.

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Square Root Both Sides

To solve a quadratic equation after completing the square and isolating the squared term, take the square root of both sides of the equation.

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Maximum Profit

Maximum profit occurs at the vertex of the profit equation.

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Evaluating a Function

To evaluate a function, substitute the given value for the variable in the function's expression and simplify.

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Tennis Ball Height

The height of the tennis ball after 'x' seconds depends on the equation f(x) = −16x² + 96x.

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Minimum Point of a Quadratic Function

The lowest point on the graph of a quadratic function that opens upwards.

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Maximum Point of a Quadratic Function

The highest point on the graph of a quadratic function that opens downwards.

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Vertex of a Parabola

The point where the parabola changes direction.

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Domain of a Function

The set of all possible input values (x-values) for which a function is defined.

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X-intercept

The point where a graph intersects the x-axis (where y=0).

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Y-intercept

The point where a graph intersects the y-axis (where x=0).

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Quadratic Function

A function that can be written in the form f(x) = ax^2 + bx + c, where a ≠ 0.

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Vertical Shift

Shifting a graph up or down on the coordinate plane.

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Minimum/Maximum Height

The lowest point on a parabola that opens upwards or the highest point on a parabola that opens downwards.

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Time to Max Height

The time at which the maximum height occurs is the x-coordinate of the vertex. Use -b/2a

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Linear Function

A function where the rate of change (slope) is constant; produces a straight line graph.

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Equation from Points

Given points on a graph, you can create a system of eqns. Plug in x and y to the standard form to find a, b, and c

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Linear increase over time.

A linear function increases by a constant amount in each time period. Ex: increase by 1,500 each year.

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Real Numbers

A function that includes all real numbers, without imaginary numbers.

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Linear Relationship

A relationship where the rate of change between any two points is constant.

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Zeros of a Quadratic Function

The values of x where the function equals zero (f(x) = 0). They are also the x-intercepts of the graph.

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Maximum Height

The highest point on the graph of a function (often a parabola).

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Time of Impact

The time when a projectile lands; when its height equals zero.

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Time to Maximum Height

How long after the stone was thrown that it reached its highest point

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Comparing Impact times

The point at which Clare's and Lin's stones hit the water.

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Comparing maximum heights

To determine if Clare's stone reached a higher point than Lin's stone.

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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 time t 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, after t 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 = â…“.

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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