factorise
x^3+3x^2+3x-7
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x³ + 3x² + 3x - 7
= x³ - x² + 4x² + 4x - 7x - 7
= x²(x - 1) - 4x (x - 1) + 7 (x + 1)
= (x - 1) (x² + 4x + 7)
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