Question

f(x) = 7x − 13. Find f−1(x).

Answer 1

hint:
two steps
1. exchange x and y
2. solve for y in terms of x.

Example:
y=g(x)=3x-2
1. exchange x and y
x=3y-2
3y=x+2
y=(x+2)/3
\(\Large g^{-1}(x)=\frac{x+2}{3}\)