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OpenStudy (anonymous):
Use the quadratic formula to find the zeros of the function. y = 16x2 + 40x + 25 A. {-1.25, 1.25} B. {-1.25} C. {-4, 5} D. {-0.8}
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Directrix (directrix):
B. {-1.25} See graph at: http://www.wolframalpha.com/input/?i=16x%5E2+%2B+40x+%2B+25+%3D+0
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