Question

If f(x) = 5x, what is f -1 (x) ?

Answer 1

`f^(-1)(x) = (x)/(5)`

Explanation:

`f^(-1)\left( x\right) =y\Longleftrightarrow f\left( y\right) =x`

…………………………

f(y) = x

⇔ 5y = x

`\Longleftrightarrow y =(x)/(5)`

`\Longleftrightarrow f^(-1)(x) = (x)/(5)`