Question

If $f(x)=3x-1$ and $g(x)=5x+6$ then $(g^{-1}o{f}^{-1})(2)=$

• A. 10
• B. -1
• C. 11
• D. 12

Answer 1

Answer: (B)

$f^{-1}\left(x\right)=\frac{x+1}{3}$
$g^{-1}\left(x\right)=\frac{x-6}{5},g^{-1}o{f}^{-1}\left(2\right)=g^{-1}\left(f^{-1}\left(2\right)\right)$