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Anonymous
(r + 9)(r + 3)
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r^2 - 12r + 27 what two factors of 27 add up to - 12? (r - 3)(r - 9) FOIL that and get the quadratic polynomial back
r(r + 5)
(r + 2)(r + 2)
(pi*r2)/2 + 4000
r2+6r-7 = (r+7)(r-1) when factored