Linear Functions

SAT Math· difficulty 3/5

If f(x)=3x5f(x) = 3x - 5, then f1(f(7))f^{-1}(f(7)) equals

  • A

    77

    check_circle
  • B

    16(5)3\dfrac{16-(-5)}{3}

  • C

    1616

  • D

    Cannot be determined

Explanation

By definition f1(f(x))=xf^{-1}(f(x)) = x, so the value is 77.

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