Functions and Relations Quiz
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Questions and Answers

Which of the following correctly defines the domain of a relation?

  • The set of first elements of the ordered pairs. (correct)
  • The set of all second elements of ordered pairs.
  • The set of values that make the second element true.
  • The set of ordered pairs where the first element is unique.
  • What constitutes a function according to the definition provided?

  • A relation with at least one ordered pair having the same first and second elements.
  • A relation where no two ordered pairs have the same first coordinates. (correct)
  • Any relation where all ordered pairs are unique.
  • A relation where two ordered pairs can share the same second element.
  • When sketching the graph of a relation with inequalities, what is the first step?

  • Identify the range based on the inequalities.
  • Determine the intersection of the regions.
  • Plot only the points where the inequalities are true.
  • Sketch the regions of each inequality in the same coordinate system. (correct)
  • In the provided relation A: R = {(x, y): y ≥ x and y ≥ -2x + 4}, what will the region look like?

    <p>An area between the lines defined by the inequalities.</p> Signup and view all the answers

    Which of the following is true about the range of a function?

    <p>It is the set of second elements of the ordered pairs.</p> Signup and view all the answers

    If a relation has ordered pairs with the same first element but different second elements, what is it classified as?

    <p>A general relation.</p> Signup and view all the answers

    In the inequality relation B: R = {(x, y): x - 2y ≤ 0 and |x| ≥ 1}, which part is true?

    <p>x values must exceed 1 in magnitude.</p> Signup and view all the answers

    What condition must be satisfied for a relation to be considered a function?

    <p>No first elements repeat in the ordered pairs.</p> Signup and view all the answers

    What is the y-intercept of the function defined by the equation f(x) = 3x^2 + 2?

    <p>(0, 2)</p> Signup and view all the answers

    In the quadratic function f(x) = ax^2 + bx + c, what can be stated about the coefficient 'a'?

    <p>'a' represents the leading coefficient and must not be equal to 0.</p> Signup and view all the answers

    When is the x-intercept of a function f(x) found?

    <p>When f(x) equals 0.</p> Signup and view all the answers

    Which of the following forms represents a quadratic function?

    <p>f(x) = 4x^2 - 7</p> Signup and view all the answers

    From the function f(x) = (x - 3)(x + 3), how would this be simplified in standard form?

    <p>f(x) = x^2 - 9</p> Signup and view all the answers

    What is the range of values for x if you are evaluating the function in the interval [-2, 2]?

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

    What shape does the graph of the quadratic function f(x) = -2x^2 take?

    <p>A concave down parabola</p> Signup and view all the answers

    Which of the following points represents the x-intercept of the function graphed by f(x) = 2x^2 + 4x + 2?

    <p>(-2, 0)</p> Signup and view all the answers

    Which of the following pairs correctly represents a function?

    <p>R = {(3, 5), (4, 5), (5, 6)}</p> Signup and view all the answers

    What is the domain of the function R1 if given as R1 = {(1, a), (3, b), (5, a)}?

    <p>{1, 3, 5}</p> Signup and view all the answers

    Which of the following best describes the range of the function R3 = {(1, a), (3, b), (5, c)}?

    <p>{a, b, c}</p> Signup and view all the answers

    What does f(x) represent in function notation?

    <p>The output corresponding to the input x.</p> Signup and view all the answers

    If a relation R is defined as R = {(x, y): y is the mother of x}, what is true about this relation?

    <p>It is a function since each child has one mother.</p> Signup and view all the answers

    Which statement is true about the function notation f(x) = 2x + 1?

    <p>f(3) = 7</p> Signup and view all the answers

    If a relation pairs 7 with both 8 and 6, what can be concluded about it?

    <p>It is not a function since it has multiple outputs for the same input.</p> Signup and view all the answers

    In the function f(x) = x - 3, what is the functional value at x = 5?

    <p>2</p> Signup and view all the answers

    What are the values of the function when x is -1 for the function f(x) = 2x^2 + 3?

    <p>11</p> Signup and view all the answers

    What is the range of the function f(x) = 2x^2 + 3?

    <p>{y: y ≥ 3}</p> Signup and view all the answers

    What is the vertex of the function f(x) = -2x^2 + 3?

    <p>(0, 3)</p> Signup and view all the answers

    Which statement is true regarding the graph of the function when a > 0?

    <p>The graph opens upward.</p> Signup and view all the answers

    What happens to the axis of symmetry for the function f(x) = 2x^2 + c as c increases?

    <p>It remains constant.</p> Signup and view all the answers

    For the function f(x) = 2x^2 - 3, what is the value of f(2)?

    <p>5</p> Signup and view all the answers

    Which graph characteristic is true for the function f(x) = -2x^2 - 3?

    <p>The range is y ≤ -3.</p> Signup and view all the answers

    What is the effect of changing the coefficient a from positive to negative in the function f(x) = ax^2 + c?

    <p>It alters the direction in which the parabola opens.</p> Signup and view all the answers

    What is the highest or lowest point of a parabola called?

    <p>Vertex</p> Signup and view all the answers

    What does the axis of symmetry of a parabola represent?

    <p>A vertical line through the vertex</p> Signup and view all the answers

    If a quadratic function is defined by the equation $f(x) = a(x - h)^2 + k$ and $a < 0$, what can be concluded about the graph?

    <p>The vertex is located at (h, k).</p> Signup and view all the answers

    What happens to the graph of a quadratic function when the absolute value of $a$ increases?

    <p>The graph becomes narrower.</p> Signup and view all the answers

    When the graph of a quadratic function opens upward, what type of value does the vertex represent?

    <p>Minimum value</p> Signup and view all the answers

    In the equation $f(x) = a(x - h)^2 + k$, how do you determine the direction the parabola opens?

    <p>By the sign of $a$</p> Signup and view all the answers

    If a quadratic function is given by $f(x) = 2x^2 + 3$, what is the direction of its graph?

    <p>Opens upward</p> Signup and view all the answers

    Shifting the graph of $f(x) = ax^2$ horizontally to the right is achieved by which transformation?

    <p>Using $(x - h)$</p> Signup and view all the answers

    Study Notes

    Relations

    • A relation is a set of ordered pairs.
    • The domain of a relation is the set of all first elements of the ordered pairs.
    • The range of a relation is the set of all second elements of the ordered pairs.
    • A relation is a function if and only if no two ordered pairs have the same first element.

    Functions

    • A function is a relation in which no two ordered pairs have the same first element.
    • The domain of a function is the set of all possible input values.
    • The range of a function is the set of all possible output values.
    • The functional value of f at x is denoted by f(x) and is called the image of x under the function f.

    Graphing Relations

    • To sketch the graph of a relation with two or more inequalities, sketch the regions of each inequality on the same coordinate system.
    • The intersection of the regions is the graph of the relation.

    Graphs of Linear Functions

    • The graph of a linear function is a straight line.
    • The slope-intercept form of a linear function is y = mx + b, where m is the slope and b is the y-intercept.
    • The y-intercept is the point where the graph crosses the y-axis.
    • The x-intercept is the point where the graph crosses the x-axis.

    Graphs of Quadratic Functions

    • A quadratic function is a function defined by f(x) = ax^2 + bx + c, where a, b, and c are real numbers and a ≠ 0.
    • The graph of a quadratic function is a parabola.
    • The vertex is the lowest or highest point of the parabola.
    • The axis of symmetry is the vertical line that passes through the vertex.
    • If a > 0, the parabola opens upward.
    • If a < 0, the parabola opens downward.
    • The graph of f(x) = a(x - h)^2 + k can be obtained by shifting the graph of f(x) = ax^2, h units to the right if h > 0, and h units to the left if h < 0, and k units up if k > 0, and k units down if k < 0.

    Minimum and Maximum Values of Quadratic Functions

    • If the graph of a quadratic function opens upward, the function has a minimum value.
    • If the graph of a quadratic function opens downward, the function has a maximum value.
    • The minimum or maximum value of a quadratic function is obtained at the vertex of its graph.

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    Relations and Functions PDF

    Description

    Test your understanding of relations and functions, including their definitions, domains, ranges, and the characteristics that distinguish a function from a general relation. Additionally, explore how to graph these relations and linear functions effectively.

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