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Solving Quadratic Equations by Factoring

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Solving Quadratic Equations by Factoring

- The quadratic equation is written in the form ax2 + bx + c = 0
- To solve quadratic equations by factoring we use the Zero Product Principle
If AB = 0 then A = 0 or B = 0

Where A and B are two quantities

Example: Solve each of the following

quadratic equations.

- x2 – 3x – 40 = 0
(x – 8)(x + 5) = 0

x – 8 = 0 or x + 5 = 0 Zero Product Principle

x = 8 or x = -5

The solution set s.s. = {8, -5}

b) 8x2 = 15 – 14x

8x2 + 14x – 15 = 0

(4x – 3)(2x + 5) = 0

4x – 3 = 0 or 2x + 5 = 0

c) 3x2 – 9x = 0

3x(x – 3) = 0

3x = 0 or x – 3 = 0

x = 0 or x = 3

s.s. = {0, 3}

- Do # 1 – 15 odd #’s only and # 19 and 21 on page 165 from section 5.5 for Tuesday May 12th