Factorise 1) x^3-2x^2-x+2
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Answered by
1
Answer:
x³-2x²-x+2 = (x³-x)-(2x²-2) = x(x²-1) -2(x²-1) = (x-2)(x²-1)
a²-b²= (a+b)(a-b)
(x²-1²) = (x+1)(x-1)
⇒x³-2x²-x+2 = (x-2)(x+1)(x-1)
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