For the function defined by f(x)=5x-4, find a formula for f^-1(x). My answer is f^-1(x)= 1 divided by 5x-4, is this right. thanks for checking.

Printable View

- Jul 3rd 2006, 11:13 AMkwtolleyfunction defined
For the function defined by f(x)=5x-4, find a formula for f^-1(x). My answer is f^-1(x)= 1 divided by 5x-4, is this right. thanks for checking.

- Jul 3rd 2006, 11:52 AMSoltras
doesn't mean .

Think of it this way:

If then the inverse function is denoted and is just the expression with the x and y switched, and then solved for y.

Switching y and x, you get:

.

Isolate the y to get:

So . - Jul 4th 2006, 01:56 AMkwtolleyanswer
I see now where I was wrong. thanks for checking my answer.