### Home > CCAA8 > Chapter 9 Unit 10 > Lesson CCA: 9.1.3 > Problem 9-28

9-28.

Use the Quadratic Formula to solve part (b) of problem 9-27 above. Did your solution match the solution you got by factoring and using the Zero Product Property (in part (b) of problem 9-27)?

**Example 2:** Solve using the Quadratic Formula.

**Solution: **This method works for *any* quadratic. First, identify , and

*.*

*equals the number of*

*-terms,*

*equals the number of*

*terms, and* -

*equals the constant. For*

*. Substitute the values of*

*, and*

*into the Quadratic Formula and evaluate the expression twice: once with addition and once with subtraction. Examine this method below:*

| ||

| or | |

| |