If f(x)=5x+12, what is f1(x)?

1 Answer
Nov 14, 2017

For convinces sake lets say f(x) is y:

y=5x+12

To find the inverse of the function, swap x and y and solve for y again.

x=5y+12

Subtract 12 on both sides:
x12=5y

Divide by 5:
y=x125

So f1(x)=x125