1. 9-4A Solving Quadratic Equations by Using the Quadratic Formula Algebra 1 Glencoe McGraw-HillLinda Stamper

2. Today you will solve quadratic equations by using the quadratic formula: The quadratic formula is read as “x equals negative b, plus or minus the square root of b squared minus 4ac, all divided by 2a.” The quadratic formula gives the solutions of ax 2 + bx + c = 0 in terms of the coefficients a, b, and c.

3. Write the equation in standard form. Identify values of a, b, and c. Write problem. Rewrite in standard form. Identify values for a, b, and c. The first step in using the quadratic formula is to identify the values of a, b, and c.

4. Example 4 Write the equation in standard form. Identify the values of a, b, and c. Example 5 Write the equation in standard form. Identify the values of a, b, and c.

5. Solve the equation. Identify values for a, b, c. Write quadratic formula.

6. Solve. If the solution involves radicals, leave in radical form. Identify values for a, b, c. Write quadratic formula. Rewrite the equation in standard form.

7. Example 7 Example 8 Example 9 Solve. If the solution involves radicals, leave in radical form.

8. Example 7 Solve. If the solution involves radicals, round to the nearest tenth.

9. Solve. If the solution involves radicals, leave in radical form. Example 8 Example 9

10. Page 497 #9-20,29–31.