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5 June, 06:20

Which statements about the graph of the function f (x) = - x2 - 4x + 2 are true? Check all that apply.

-The domain is x ≤ - 2.

-The range is y.

-The function is increasing over the interval (-∞, - 2).

-The function is decreasing over the interval (-4, ∞).

-The function has a positive y-intercept.

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Answers (2)
  1. 5 June, 07:22
    0
    Statements 2, 3, and 5 are true based on the graph of this function.
  2. 5 June, 08:46
    0
    Remark

    There is nothing like a graph to settle arguments about which property is to be checked.

    Property One

    The graph's domain is (-∞
    Property two

    The graph says that property two is true. You could complete the square to confirm it. When you do you get

    y = - (x^2 + 4x) + 2

    y = - (x^2 + 4x + 4) + 2 + 4

    y = - (x + 2) ^2 + 6 So the y value must be less that 6 (or equal to 6)

    Property Three

    Property 3 is true if you are referring to the domain and neither - 2 nor - infinity are included.

    Property Four

    Property Four is not true, It begins to decrease when x>-2 to + infinity

    Property Five

    It is positive (2).
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