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OpenStudy (anonymous):
factor each expression. -x^2+3x+40
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Directrix (directrix):
-x^2+3x+40 = - ( x² - 3x - 40) = - (x² - 8x + 5x - 40) = - [ x(x - 8) + 5(x - 8) ] = - [(x - 8) (x + 5)] = ? @cutegirl
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