### Home > CALC > Chapter 7 > Lesson 7.2.2 > Problem 7-70

7-70.

Once again, Greta is in a pickle! She is trying to solve the following equation and knows she can use -substitution to do it:

Greta thinks if she lets

she can write the problem as a quadratic equation. Show Greta she is correct.

Solve for.

Then solve for.

Use your answer to part (a) to find the value(s) of

.