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Lesson 43 Solving Quadratic Equations by Factoring with answers.notebook
1
January 12, 2015
Lesson 43 Solving Quadratic Equations by Factoring
factored form 0 = a(x p)(x q) where p and q represent the xintercepts of the graph of the equation
FOIL Method: To multiply two binomials, find the sum of the products of F the first terms, O the Outer terms, I the Inner terms, and L the Last terms.
Example 1a. Write a quadratic equation in standard form with and 5 as its roots.
b. Write a quadratic equation in standard form with and 6 as its roots.
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Lesson 43 Solving Quadratic Equations by Factoring with answers.notebook
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January 12, 2015
Zero Product PropertyFor any real numbers a and b, if ab = 0, then either a = 0, b = 0, or both a and b equal zero.
If (x + 3)(x 5) = 0, then x + 3 = 0 or x 5 = 0.
Example 2Solve each equation.a. 9y2 + 3y = 0
b. 5a2 20a = 0
Example 3Solve each equation.a. x2 6x + 9 = 0
b. y2 = 36
Lesson 43 Solving Quadratic Equations by Factoring with answers.notebook
3
January 12, 2015
Example 4Solve each equation.a. x2 2x 15 = 0
b. 5x2 + 34x + 24 = 0
Example 5The entrance to an office building is an arch in the shape of a parabola whose vertex is the height of the arch. The height of the arch is given by h = 9 x2, where x is the horizontal distance from the center of the arch. Both h and x are measured in feet. How wide is the arch at ground level?
Lesson 43 Solving Quadratic Equations by Factoring with answers.notebook
4
January 12, 2015
Lesson 43 Solving Quadratic Equations by Factoring with answers.notebook
5
January 12, 2015