9-5 Skills Practice Solving Quadratic Equations by Using the Quadratic Formula Solve each equation by using the Quadratic Formula. Round to the nearest tenth if necessary. 1. 49 = 0 2. 20 = 0 x – – – 5x 36 = 0 + 11x + 30 = 0 3. 4. – – 5. 7x = 6. + 4x = – –3 –1 7. 9x + 22 = 0 8. + 6x + 3 = 0 – 9. 2 + 5x 7 = 0 10. 2 3x = – – –1 11. 2 + 5x + 4 = 0 12. 2 + 7x = 9 13. 3 + 2x 3 = 0 14. 3 7x 6 = 0 – – – State the value of the discriminant for each equation. Then determine the number of real solutions of the equation. + 4x + 3 = 0 + 2x + 1 = 0 15. 16. 17. 4x + 10 = 0 18. 6x + 7 = 0 – – 19. 2x 7 = 0 20. 10x + 25 = 0 – – – 21. 2 + 5x 8 = 0 22. 2 + 6x + 12 = 0 – 23. 2 4x + 10 = 0 24. 3 + 7x + 3 = 0 –
9-5 Skills Practice Solving Quadratic Equations by Using the Quadratic Formula Solve each equation by using the Quadratic Formula. Round to the nearest tenth if necessary. 1. – 49 = 0 2. – x – 20 = 0 3. – 5x – 36 = 0 4. + 11x + 30 = 0 5. – 7x = –3 6. + 4x = –1 7. – 9x + 22 = 0 8. + 6x + 3 = 0 9. 2 + 5x – 7 = 0 10. 2 – 3x = –1 11. 2 + 5x + 4 = 0 12. 2 + 7x = 9 13. 3 + 2x – 3 = 0 14. 3 – 7x – 6 = 0 State the value of the discriminant for each equation. Then determine the number of real solutions of the equation. 15. + 4x + 3 = 0 16. + 2x + 1 = 0 17. – 4x + 10 = 0 18. – 6x + 7 = 0 19. – 2x – 7 = 0 20. – 10x + 25 = 0 21. 2 + 5x – 8 = 0 22. 2 + 6x + 12 = 0 23. 2 – 4x + 10 = 0 24. 3 + 7x + 3 = 0
9.5-Skills-Solving-Quadratic-Equations-by-Using-the-Quadratic-Formula.docx