### Home > INT3 > Chapter 2 > Lesson 2.2.5 > Problem2-128

2-128.

Throughout this book, key problems have been selected as “checkpoints.” Each checkpoint problem is marked with an icon like the one at left. These checkpoint problems are provided so that you can check to be sure you are building skills at the expected level. When you have trouble with checkpoint problems, refer to the review materials and practice problems that are available in the Checkpoint Materials section at the back of your book.

This problem is a checkpoint for solving quadratic equations. It will be referred to as Checkpoint 2.

Solve each quadratic equation.

1. $x^2−x−6=0$

1. $5x^2-8=12x$

1. $x^2−8x+20=0$

1. $2y^2−5y=12$

Check your answers by referring to the Checkpoint 2 materials located at the back of your book.

Ideally at this point you are comfortable working with these types of problems and can solve them correctly. If you feel that you need more confidence when solving these types of problems, then review the Checkpoint 2 materials and try the practice problems provided. From this point on, you will be expected to do problems like these correctly and with confidence.

Answers and extra practice are located in the back of your printed textbook or in the Reference Tab of your eBook. If you have an eBook for Integrated III, login and then click the following link: Checkpoint 2: Solving Quadratic Equations