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11 April, 14:02

For all functions of the form f (x) = ax2 + bx + c, which is true when b = 0?

A. The graph will always have zero x-intercepts.

B. The function will always have a minimum.

C. The y-intercept will always be the vertex.

D. The axis of symmetry will always be positive.

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Answers (1)
  1. 11 April, 14:21
    0
    When b=0

    f (x) = ax^2+c

    test each

    A. with x^2-1, A is false

    B. with - x^2-1, B is false

    C. cannot find contradiction

    D. the axis is actually x=0, 0 is nithere positive nor negative, false

    answer is C
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