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How do I Change y=x^2-2x-8 into factored form and then use the zero product property to find the x intercepts?

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Plz help!!!!!!!

How do I Change y=x^2-2x-8 into factored form and then use the zero product property to find the x intercepts?

asked Mar 5, 2014 in ALGEBRA 2 by angel12 Scholar

1 Answer

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The equation is y = x ^2 - 2x - 8

y  = x ^2 - 4x + 2x - 8

y  = x (x - 4) + 2(x - 4)

Take out common factors.

Factored form is = (x - 4)(x + 2)

To find x  intercepts substitute y  = 0 in y  = (x - 4)(x + 2)

0 = (x - 4)(x + 2)

Apply zero product property .

x - 4 = 0 and x + 2 = 0

x  = 4 and x = -2

intercepts are 4 and -2.

answered Mar 29, 2014 by david Expert

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