factorise x^3-2x^2-x+2.please give me step by step explaination briefly.(If you know the answer, then only answer my question.Otherwise I will report you!)
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Answer:
x³ - 2x² - x + 2
= x²(x - 2) - (x - 2)
= (x² - 1)(x - 2)
= (x - 1)(x + 1)(x - 2)
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