Factorise x3 - 23x2 + 142x - 120.
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Q- 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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