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OpenStudy (anonymous):
Factor the following polynomial completely. 0.4x^2 - 4x + 8.4
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Directrix (directrix):
Try factoring out .4 from each term. 0.4x^2 - 4x + 8.4 = .4( x^2 -10x + 21) = ? @kaykayn5 What are two numbers that multiply to 21 and also add to -10
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