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Solving by Factoring Happy yesterday birthday to Cody Wakeland November 14 th. Factor x 2 + 2x – 8. Graph y = x 2 + 2x – 8. Finding Zeros. How do you find the zeros? . Finding Zeros Algebraically:. 1. Make sure the polynomial is set = 0. 2. Factor the polynomial.
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Solving by FactoringHappy yesterday birthday to Cody WakelandNovember 14th
Factor x2 + 2x – 8 Graph y = x2 + 2x – 8 Finding Zeros How do you find the zeros?
Finding Zeros Algebraically: 1. Make sure the polynomial is set = 0. 2. Factor the polynomial. 3. Set each factor equal to 0.
Factor the polynomial. • x2 + 2x – 8 = 0 • (x + 4)(x – 2) = 0 • x + 4 = 0 x – 2 = 0 • x = -4 x = 2 Set each factor equal to 0.
Find the solutions. • x2 + x – 12 = 0 • x = -4 x = 3
Find the solutions. • x2 + 12x = 0 • x = 0 x = -12
Find the solutions. • x2 – 16 = 0 • x = -4 x = 4
Find the solutions. • 2x2 -5x – 3 = 0 • x = -1/2 x = 3
TAKS • If the area of a rectangle is given by x2 + 8x + 15, what are the length and width of the rectangle?
TAKS • If the length of a rectangle is x – 5 and its area is 3x2 – 15x, then what is its width?
TAKS • Mike was factoring out x2 – 5x – 14 but he thinks he made a mistake. Can you find it? 2x2 – 5x – 7 Step 1: x2 – 5x – 14 Step 2: (x – 2)(x + 7) Step 3: (x – 1)(x + 7/2) Step 4: (x – 1)(2x + 7)
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