Section 5.3 Factoring Quadratic Expressions Objectives: Factor a quadratic expression. Use factoring to solve a quadratic equation and find the zeros of.

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Section 5.3 Factoring Quadratic Expressions Objectives: Factor a quadratic expression. Use factoring to solve a quadratic equation and find the zeros of a quadratic function. Standard: N. Solve quadratic equations.

I. Factoring Quadratic Expressions

Example 1 c and d c. 27a 2 – 18a d. 5x(2x + 1) – 2(2x + 1)

II. Factoring x 2 + bx + c. (TRIAL & ERROR) To factor an expression of the form ax 2 + bx + c where a = 1, look for integers r and s such that r s = c and r + s = b. Then factor the expression. x 2 + bx + c = (x + r)(x + s)

Example 1 – Factor by Trial & Error

Example 1b

Example 1 c and d c. x 2 + 9x + 20

Example 2 – Factor and check by graphing

Example 2b 3x 2 +11x – 20 Guess and Check

Factoring the Difference of 2 Squares Factoring Perfect Square Trinomials a 2 – b 2 = (a + b)(a – b) a 2 + 2ab + b 2 = (a + b) 2 or a 2 – 2ab + b 2 = (a – b) 2 c.9x 4 – 49d.9x 2 – 36x + 36

Zero Product Property IV. A zero of a function f is any number r such that f(r) = 0. Zero-Product Property If pq = 0, then p = 0 or q = 0. An equation in the form of ax 2 + bx + c = 0 is called the general form of a quadratic equation.

Example 1

Example 1 c and d c. f(x) = 3x 2 – 12x d. g(x) = x 2 + 4x – 21

Ex 2. An architect created a proposal for the fountain at right. Each level (except the top one) is an X formed by cubes. The number of cubes in each of the four parts of the X is one less than the number on the level below. A formula for the total number of cubes, c, in the fountain is given by c = 2n - n, where n is the number of levels in the fountain. How many levels would a fountain consisting of 66 cubes have?

Writing Activities 2. a. Shannon factored 4x 2 – 36x + 81 as (2x + 9) 2. Was she correct? Explain. b. Brandon factored 16x 2 – 25 as (4x – 5) 2. Was he correct? Explain.