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OpenStudy (anonymous):
solve x^2 + 8x + 16 = 0
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Directrix (directrix):
(x + 4) (x + 4) = 0 Zero Product Property x + 4 = 0 or x + 4 = 0 x = -4 or x = -4 -4 is a double root.
Directrix (directrix):
Take a look at the graph: http://www.wolframalpha.com/input/?i=x%5E2+%2B+8x+%2B+16+%3D+0
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