How to factorise expressions in algebric expression?
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let us do an example,
let p(x) = x^3-23x^2+142x-120
= x^3-x^2-22x^2+22x+120x-120
= x^2(x-1)-22x(x-1)+120(x-1)
= (x-1)(x^2-22x+120
let p(x) = x^3-23x^2+142x-120
= x^3-x^2-22x^2+22x+120x-120
= x^2(x-1)-22x(x-1)+120(x-1)
= (x-1)(x^2-22x+120
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