xcube -3xsquare -3x-4 factorise
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x³ - 3x² - 3x - 4
x³ + x² - 4x² + x - 4x - 4
x³ + x² + x - 4x² - 4x - 4
x (x² + x + 1 ) - 4(x² + x + 1)
(x-4) (x² + x + 1)
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