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Nonlinear Functions

SAT Math· difficulty 5/5

Let f(x)=5−2xf(x) = 5 - 2x. What is f−1(3)f^{-1}(3)?

  • A

    33

  • B

    11

    check_circle
  • C

    55

  • D

    −1-1

Explanation

Solve f(x)=3f(x) = 3: 5−2x=3⇒2x=2⇒x=15 - 2x = 3 \Rightarrow 2x = 2 \Rightarrow x = 1.

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