### Home > CCA2 > Chapter 1 > Lesson 1.1.1 > Problem 1-4

1-4.

"Find " means to find the output of function

*for an input of*

*x*= 3. For the function

Find

. (This means find the output of the function when*x*= 4.)Substitute 4 for each

*x*.Simplify.

Find

when. (This means find the input that gives an output of 1.)Substitute 1 for

*f*(*x*).Solve for

*x*(multiply both sides by*x*− 2).*x*= 3