factorise : x³-2x²+142x-120
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Step-by-step explanation:
x3−23x2+142x−120
=x3−x2−22x2+22x+120x−120
=x2(x−1)−22x(x−1)+120(x−1)
=(x−1)(x2−22x+120)
=(x−1)[x2−10x−12x+120]
=(x−1)[x(x−10)−12(x−10)]
=(x−1)(x−10)(x−12)
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