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Nonlinear Functions

SAT Math· difficulty 4/5

A parabola has vertex (1,−4)(1, -4) and one x-intercept at x=3x = 3. The other x-intercept is:

  • A

    x=−3x = -3

  • B

    x=−1x = -1

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  • C

    x=5x = 5

  • D

    x=0x = 0

Explanation

By symmetry: x-intercepts equidistant from axis x=1x = 1. From x=3x = 3 to x=1x = 1 is 2; mirror is x=−1x = -1.

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