Question

1). f(x) = 3x + 15 then what's f^-1(x)?​

Answer 1

Explanation:

f(x)=3x+15

let f(x)=y

y=3x+15

flip x and y

x=3y+15

3y=x-15

y=1/3 x-5

or f^{-1}x=1/3 x-5