x3-13x2+20x+32 factorise
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The value of x3+13x2+32x+20 is
x3+x2+12x2+12x+20x+20
=x2(x+1)+12x(x+1)+20(x+1)
=(x−1)(x2+12x+20)
=(x−1)(x2+10x+2x+20)
=(x+1)[x(x+10)+2(x+10)]
=(x+1)(x+2)(x+10)
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