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Anonymous
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
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9p + 27 = 9(p + 3)
(a + 9)(a - 3)
a2 + 12a + 27 = (a + 3)(a + 9)
(r + 9)(r + 3)
(w + 3)(w^2 - 3w + 9)