Factorise : x^3 - 3x^2 - 9x - 5.
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➡X³ - 3x² - 9x - 5 = 0
= x³ + x² - 4x² - 4x - 5x - 5 = 0
= x²( x + 1) - 4x ( x + 1) - 5(x + 1) = 0
= (x + 1) (x² - 4x - 5) = 0
= (x + 1) (x² -5x + x - 5) = 0
= (x + 1) (x - 5) (x + 1) = 0
hence, (x +1), (x -5) and (x +1) are the factors of given polynomial
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