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(x+3)(x+15)
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x2 + 18x + 45 = (x + 15)(x + 3).
9x2 - 18x + 99(x2 - 2x + 1)==========
(X-9)2
x2-18x+81 = (x-9)(x-9) when factored
6x5(x2 - 6x + 3)