### Home > APCALC > Chapter 1 > Lesson 1.4.4 > Problem 1-189

1-189.

Let . Homework Help ✎

What is

?Write an expression for

and simplify.Substitute

for . Simplify.If

, what are the possible values of?Set

equal to and solve for .Write an equation for

.Let

. Solve for. Then switch theand.Remember the

.