There are four common ways to solve quadratic equations. You practiced the first when you used the zero-product method in chapter 5. Today you'll practice the second which uses the square root/squaring inverse relationship to solve one type of quadratic equation. This material is covered on pages 307-312 in the Engaging Algebra textbook.
7.1 The Square Root Method
After practicing with these videos you'll be able to solve quadratic equations using the idea that squaring "undoes" a square root.