Question

Let f(x) = 5x + 12. Find f-1 (x).

Answer 1

`f(x)=5x+12\\\\ f^(-1)(x):\\ y=5x+12\ \ \ |Subtract\ 12\\ y-12=5x\ \ \ |Divide\ by\ 5\\ (y-12)/(5)=x\\\\ f{-1}(x)=(x-12)/(5)`

Answer 2

f^-1(x) = x/5 - 12/5

Explanation:

f(x) = 5x + 12

y = 5x + 12

x = 5y + 12

5y = x - 12

y = x/5 - 12/5

f^-1(x) = x/5 - 12/5