18.Factorise x3 -23 x2 +142x -120
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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-(12+10)x+120}
=(x-1)(x²-12x-10x+120)
=(x-1){x(x-12)-10(x-12)}
=(x-1)(x-12)(x-10)
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