1. Quick Review

2. Quick Review Solutions

3. Solving Equations in One Variable
2.7
Solving Equations in One Variable

4. Extraneous Solutions
When we multiply or divide an equation by an expression containing variables, the resulting equation may have solutions that are not solutions of the original equation. These are extraneous solutions. For this reason we must check each solution of the resulting equation in the original equation.

5. Example

6. Example Solving by Clearing Fractions

7. Example

8. Example Eliminating Extraneous Solutions

9. Example Finding a Minimum Perimeter

10. Example Finding a Minimum Perimeter