factorise the sum x³+x²-4x-4
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x^3+x^2-4x-4
x^2 (x+1)-4 (x+1)
(x+1)(x^2-4)
(x+1)(x+2)(x-2)
x^2 (x+1)-4 (x+1)
(x+1)(x^2-4)
(x+1)(x+2)(x-2)
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