(x³-9x)+(45-5x²)
X(x^2-9)-5(-9+x^2)
X(x-3)(x+3)-5(x-3)(x+3)
(x-5)(x-3)(x+3)
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(x³-9x)+(45-5x²)
X(x^2-9)-5(-9+x^2)
X(x-3)(x+3)-5(x-3)(x+3)
(x-5)(x-3)(x+3)