The function f(x) = x^3 + 3x^2 - 9x - 27
x^3 + 3x^2 - 9x - 27
=> x^2(x + 3) - 9(x + 3)
=> (x^2 - 9)(x + 3)
=> (x - 3)*(x + 3)^2
As a product of its linear factors f(x) = (x - 3)*(x + 3)^2
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