Question

if f(x)= sqrt (8-5x), find a formula for f^(-1)(x)

Answer 1

\[x=\sqrt{8-5y}\]
\[x^2=8-5y\]
\[5y=8-x^2\]
\[y=\frac{8-x^2}{5}\]
\[f^{-1}(x)=\frac{8-x^2}{5}\]

Answer 2

inverse of (3x-10)/(9x+9)