Quadratic Relations and Transformations
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Questions and Answers

What is the equation of the quadratic function in standard form with zeros of -3 and 1, passing through the point (-1, -7)?

  • y = -2x² - 4x - 3
  • y = -2x² + 4x - 3
  • y = -2x² - 4x + 3
  • y = -2x² + 4x + 3 (correct)
  • What is the equation of the quadratic function in vertex form with a vertex of (-2, 3) and passing through the point (-1, 6)?

  • y = 3(x - 2)² + 3
  • y = 3(x + 2)² + 3 (correct)
  • y = 3(x + 2)² - 3
  • y = 3(x - 2)² - 3
  • What is the equation of the quadratic function in factored form which has zeros of -2 and 4 and a y-intercept of -3?

  • y = -½(x + 2)(x - 4)
  • y = ½(x + 2)(x - 4)
  • y = ¾(x + 2)(x - 4)
  • y = -¾(x + 2)(x - 4) (correct)
  • What is the equation of the quadratic function in vertex form, with a maximum at (4, -2) and congruent to y = 2x²?

    <p>y = -2(x - 4)² - 2 (B)</p> Signup and view all the answers

    What is the equation of the quadratic function in standard form with a vertex of (-4, 1) and a y-intercept of -5?

    <p>y = 1/8x² - 1/2x - 5 (A)</p> Signup and view all the answers

    What is the step pattern of a parabola with the equation y = 2(x - 3)^2 + 1?

    <p>Over 1, Up 2 (C)</p> Signup and view all the answers

    What is the optimal value of the quadratic relation y = -x^2 + 4x + 5?

    <p>9 (B)</p> Signup and view all the answers

    Which of the following is NOT a characteristic of the axis of symmetry of a parabola?

    <p>It determines the direction of opening of the parabola. (D)</p> Signup and view all the answers

    What is the y-intercept of the quadratic relation y = 2x^2 - 3x + 1?

    <p>(0, 1) (D)</p> Signup and view all the answers

    If the vertex of a parabola is located at the point (2, -3), what is the equation of the axis of symmetry?

    <p>x = 2 (D)</p> Signup and view all the answers

    What is the domain of the quadratic relation y = x^2 - 4x + 3?

    <p>All real numbers (A)</p> Signup and view all the answers

    What are the zeros of the quadratic relation y = x^2 - 4?

    <p>x = 2, x = -2 (B)</p> Signup and view all the answers

    If a parabola opens downwards, what can you conclude about the coefficient of the squared term in its equation?

    <p>The coefficient is negative. (C)</p> Signup and view all the answers

    What is the quadratic equation that models the number of imported cars sold in Newfoundland between 2003 and 2007?

    <p>𝑦 = 76.85714𝑥 2 − 308177.94285714𝑥 + 308932906.6 (B)</p> Signup and view all the answers

    Using the quadratic equation, how many imported cars would you expect to be sold in 2008?

    <p>4516 (A)</p> Signup and view all the answers

    What does the model predict for the number of imported cars sold in 2006?

    <p>3862 (A)</p> Signup and view all the answers

    In the quadratic inequality 𝑥 2 − 4 ≤ 0, what is the interval where the graph of the quadratic relation is on or below the x-axis?

    <p>-2 ≤ x ≤ 2 (D)</p> Signup and view all the answers

    What is the factored form of the quadratic inequality 𝑥 2 − 4 ≤ 0?

    <p>(𝑥 + 2)(𝑥 − 2) ≤ 0 (A)</p> Signup and view all the answers

    Using an interval chart to solve the quadratic inequality 𝑥 2 − 4 ≤ 0, where does the product of the factors (𝑥 + 2) and (𝑥 − 2) change signs?

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

    In the context of solving quadratic inequalities, what does the term 'interval' refer to?

    <p>A set of numbers between two specified numbers (C)</p> Signup and view all the answers

    What is the main difference between solving a quadratic equation and a quadratic inequality?

    <p>A quadratic equation results in a specific value for the variable, while a quadratic inequality results in an interval of possible values. (B)</p> Signup and view all the answers

    A campground charges $20.00 to camp for one night and averages 56 people each night. If they decrease the price by $1.00, the number of campers increases by 7. What is the price that will maximize nightly revenue?

    <p>$14.00 (D)</p> Signup and view all the answers

    A toy rocket is launched with an initial velocity of 180 m/s and its height is modeled by h = -5t² + 180t, where t is the time in seconds. How long will the rocket stay above a height of 1000 meters?

    <p>25 seconds (C)</p> Signup and view all the answers

    A farmer has $5200 to spend on fencing for a pen along a river. The company charges $6.50 per meter for fencing. The farmer can choose between a rectangular pen with the river as one side or a right triangular pen with the hypotenuse along the river. Which shape maximizes the area of the pen?

    <p>Both shapes have the same maximum area. (B)</p> Signup and view all the answers

    The cost per book (C) when a school orders yearbooks is modeled by C = 0.00005n² - 0.095n + 66.125, where n is the number of books ordered. What is the least cost per book, and how many yearbooks should be ordered to achieve this cost?

    <p>The least cost is $21 per book when 950 yearbooks are ordered. (A)</p> Signup and view all the answers

    A ball is thrown into the air, and its height (h) in meters after t seconds is modeled by h = -5t² + 20t + 1. After how many seconds, rounded to two decimal places, does the ball hit the ground?

    <p>4.05 seconds (D)</p> Signup and view all the answers

    An object is thrown upward with an initial velocity of v m/s from an initial height of c meters. The height (h) after t seconds is modeled by h = -5t² + vt + c. What is the initial velocity of the object if it reaches its maximum height after 4 seconds?

    <p>40 m/s (D)</p> Signup and view all the answers

    The distance (d) a car travels while skidding is modeled by d = 250 + 50t - 4t², where t is the time in seconds taken to stop. How long does it take the car to stop?

    <p>6.25 seconds (D)</p> Signup and view all the answers

    The city bus company carries an average of 3500 passengers daily, with each passenger paying $2.25. If the company increases the price by $0.25, the number of passengers decreases by 100. What is the fare that will maximize the company's revenue?

    <p>$2.75 (A)</p> Signup and view all the answers

    What is the maximum daily revenue from coffee sales at The Next Cup coffee shop when the price per mug is optimized?

    <p>$680 (D)</p> Signup and view all the answers

    What was the height of the football at the moment it was kicked?

    <p>1.1 m (A)</p> Signup and view all the answers

    For the parabola defined by y = -2(x + 5)² - 4, what is the value of the minimum?

    <p>-4 (C)</p> Signup and view all the answers

    How many x-intercepts does the parabola y = -3x² have?

    <p>0 (A)</p> Signup and view all the answers

    What is the vertex of the parabola represented by y = 3x² + 18x + 21?

    <p>(-3, 12) (B)</p> Signup and view all the answers

    How long does it take for Baz Ketball's shot to reach its peak height?

    <p>2 seconds (B)</p> Signup and view all the answers

    In the function h = -5t² + 10t + 3, what is the distance above the floor when the ball reaches its peak?

    <p>6 m (C)</p> Signup and view all the answers

    What is the equation of the parabola that has a vertex at (2,4) and a y-intercept of -4?

    <p>y = -1(x - 2)² + 4 (C)</p> Signup and view all the answers

    What is the maximum revenue formula for a bus company in terms of price increases, given they lose customers?

    <p>M = -12.5n^2 + 762.5n + 7875 (D)</p> Signup and view all the answers

    What dimensions will maximize the area for a garden that uses 24 m of fencing on three sides?

    <p>8 m by 4 m (A)</p> Signup and view all the answers

    To maximize sales revenue, at what price should Tom sell his T-shirts if he currently sells them at $10?

    <p>$9 (B)</p> Signup and view all the answers

    At what price should Mila set her CDs, originally priced at $20 with a drop in sales for every increase?

    <p>$19 (A)</p> Signup and view all the answers

    How long will it take for the ball to reach a height of 35 m, given the height equation h = -4.9t^2 + 30t + 1.6?

    <p>1.46 seconds (B)</p> Signup and view all the answers

    When will a ball thrown into the air hit the ground if described by h = -4.9(t - 2)^2 + 20?

    <p>4.02 seconds (C)</p> Signup and view all the answers

    What is the height equation for a wrench tossed on the moon?

    <p>h = –0.8t^2 + 10t + 1.4 (A)</p> Signup and view all the answers

    After how many seconds will the wrench hit the ground according to its height equation?

    <p>12.6 seconds (A)</p> Signup and view all the answers

    Study Notes

    Quadratic Relations

    • Quadratic relations are relationships between variables that can be represented by a second-degree polynomial.
    • The general form of a quadratic relation is y = ax² + bx + c, where 'a', 'b', and 'c' are constants.
    • A quadratic relation has a graph that is a parabola.
    • A parabola can open upwards or downwards depending on the value of 'a'.
    • If 'a' is positive, the parabola opens upward.
    • If 'a' is negative, the parabola opens downward.
    • The vertex is the highest or lowest point on the parabola.
    • The axis of symmetry is a vertical line that divides the parabola into two symmetrical halves.
    • The zeros of a quadratic relation are the x-intercepts (the points where the graph crosses the x-axis).
    • The y-intercept is the point where the graph crosses the y-axis.
    • The domain of a quadratic relation is the set of all possible x-values.
    • The range of a quadratic relation is the set of all possible y-values.

    Transformations of Quadratics

    • Transformations of quadratic functions involve shifting, stretching, compressing, or reflecting the graph of the basic quadratic function (y = x²).
    • The vertex form of a quadratic function is y = a(x - h)² + k, where (h, k) represents the coordinates of the vertex.
    • The value of 'a' affects the vertical stretch or compression of the parabola.
    • A positive value of 'a' indicates an upward opening parabola.
    • A negative value of 'a' indicates a downward opening parabola.
    • The value of 'h' affects the horizontal translation of the parabola.
    • A positive value of 'h' shifts the graph to the right.
    • A negative value of 'h' shifts the graph to the left.
    • The value of 'k' affects the vertical translation of the parabola.
    • A positive value of 'k' shifts the graph upward.
    • A negative value of 'k' shifts the graph downward.

    Applications of Quadratics

    • Quadratic functions can model various real-world situations, including projectile motion, optimization problems, and business scenarios.
    • A range of word problems can be solved using quadratic relations such as profit maximization, projectile motion, or area maximisation

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    Description

    This quiz explores the concepts of quadratic relations, including their standard form, properties, and transformations. Learn about parabolas, their vertices, symmetry, and intercepts while deepening your understanding of these key mathematical principles.

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