Question

If f; R → R f(x) = 10x + 3 then f^–1(x) is:

Options

• `3/10`

• `(-3)/10`

• `(3 - x)/10`

• `(x - 3)/10`

Answer 1

`(x - 3)/10`

Explanation:

y = 10x + 3

⇒ `x = (y - 3)/10`

⇒ `f^-1(y) = (y - 3)/10, f^-1(x) - (x - 3)/10`