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-x2-14x-45 = -(x2+14x+45)

delta = 142-4*1*45=16

so x2+14x+45=(x-(-14+4)/2) (x-(-14-4)/2) = (x+5)(x+9)

so -x2-14x-45 = -(x+5)(x+9)

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14y ago

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