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Anonymous
(x + 8)(x + 2)
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If you mean x^2 -10x+16 then it is (x-2)(x-8) when factored
(x - 8)(x - 2)
x2 + 10x + 21 = (x + 3)(x + 7)
(x2+10x+21)/(x+3) = (x+7)