### Home > INT3 > Chapter 1 > Lesson 1.1.1 > Problem 1-4

1-4.

For the function **Homework Help ✎**

What is

? (This means calculate the output of the function when.)Substitute

for each .Simplify.

What is

? (This means determine the input that gives an output of.) Substitute

for .Solve for

(multiply both sides by).