**Given the function f(x) = 4(x+3) − 5, solve for the inverse function when x = 3**

**Answer:**

Well,

we have :

y = f(x)

y = 4x + 12 - 5

y = 4x + 7

4x = y - 7

so the inverse function f^-1 is :

x = f^-1(y) = y/4 - 7/4

therefore :

f^-1(y) = y/4 - 7/4

and for y = 3 we get :

f^-1(3) = 3/4 - 7/4

f^-1(3) = -1 <— last answer