Solving Quadratic Equations Using the Quadratic Formula - PowerPoint PPT Presentation

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Solving Quadratic Equations Using the Quadratic Formula

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  1. Solving Quadratic Equations Using the Quadratic Formula MA.912.A.7.2 Solve quadratic equations over the real numbers by factoring and by using the quadratic formula.

  2. The Quadratic Formula The solutions of a quadratic equation written in Standard Form, ax2 + bx + c = 0, can be found by Using the Quadratic Formula. Click on the link below to view a song to help you memorize it. http://www.regentsprep.org/Regents/math/algtrig/ATE3/quadsongs.htm

  3. Deriving the Quadratic Formula by Completing the Square. Divide both sides by “a”. Subtract constant from both sides.

  4. Deriving the Quadratic Formula by Completing the Square. Complete The Square Factor the Perfect Square Trinomial Simplify expression on the left side by finding the LCD

  5. Deriving the Quadratic Formula by Completing the Square. Take the square root of both sides Solve absolute value/ Simplify radical

  6. Deriving the Quadratic Formula by Completing the Square. Isolate x Simplify Congratulations! You have derived The Quadratic Formula

  7. #1 Solve using the quadratic formula.

  8. Graph Clink on link for graphing calculator. http://my.hrw.com/math06_07/nsmedia/tools/Graph_Calculator/graphCalc.html

  9. #1 Solve by factoring

  10. #2 Solve by factoring This quadratic is Prime (will not factor), The Quadratic Formula must be used!

  11. #2 Solve using the quadratic formula. Exact Solution Approx Solution

  12. Graph Clink on link for graphing calculator. http://my.hrw.com/math06_07/nsmedia/tools/Graph_Calculator/graphCalc.html

  13. #3 Solve using the quadratic formula The is not a real number, therefore this equation has ‘NO Real Solution’

  14. Graph Clink on link for graphing calculator. http://my.hrw.com/math06_07/nsmedia/tools/Graph_Calculator/graphCalc.html

  15. #4 Solve using the quadratic formula Would factoring work to solve this equation?

  16. Graph Clink on link for graphing calculator. http://my.hrw.com/math06_07/nsmedia/tools/Graph_Calculator/graphCalc.html

  17. #5 Solve using the quadratic formula. Exact Solution Approx Solution

  18. #5 What if we move everything to the right side? Exact Solution Approx Solution

  19. Graph Clink on link for graphing calculator. http://my.hrw.com/math06_07/nsmedia/tools/Graph_Calculator/graphCalc.html

  20. The Discriminant The expression inside the radical in the quadratic formula is called the Discriminant. The discriminant can be used to determine the number of solutions that a quadratic has.

  21. Understanding the discriminant Discriminant # of real solutions Perfect square 2 real rational solutions Not Perfect 2 real irrational solutions 1 real rational solution No real solution

  22. #6 Find the discriminant and describe the solutions to the equations. 2 Real Rational Solutions

  23. #7 Find the discriminant and describe the solutions to the equations. No Real Solutions

  24. #8 Find the discriminant and describe the solutions to the equations. 2 Real Irrational Solutions

  25. #9 Find the discriminant and describe the solutions to the equations. 1 Real Rational Solution