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Linear Functions

SAT Math· difficulty 4/5

If f(x)=2x+5f(x) = 2x + 5, what is f−1(f−1(11))f^{-1}(f^{-1}(11))?

  • A

    1111

  • B

    −1-1

    check_circle
  • C

    33

  • D

    −2-2

Explanation

f−1(x)=(x−5)/2f^{-1}(x) = (x - 5)/2. f−1(11)=3f^{-1}(11) = 3. f−1(3)=−1f^{-1}(3) = -1.

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