Question

If F(x)= 9x, which of the following is the inverse of F(x)?

a. F^-1(x)= x/9
b. F^-1(x) = x-9
c. F^-1(x)= 9/x
d. F^-1(x)=x+9

Answer 1

is it A?

Answer 2

inverse you switch x and y and then solve of y

\[f(x) = 9x \]

\[y = 9x\]

we switch x and y

\[x = 9y\]

then solve for y

\[\frac{ x }{ 9 } = y \]

hence

\[f^{-1}(x) = \frac{ x }{ 9 }\]