Nonlinear Functions

SAT Math· difficulty 3/5

If f(x)=xf(x) = \sqrt{x} and g(x)=x4g(x) = x - 4, what is f(g(13))f(g(13))?

  • A

    134\sqrt{13} - 4

  • B

    99

  • C

    1313

  • D

    33

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Explanation

g(13)=9g(13) = 9, then f(9)=9=3f(9) = \sqrt{9} = 3.

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