factorise x³+13x²+32x+20 by using the factor theorem
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Answer:
x^3+13x^2+32x+20
=x^3+12x^2+x^2+12x+20x+20
=x^2(x+1)+12x(x+1)+20(x+1)
=(x^2+12x+20)(x+1)
=(x+1)(x^2+2x+10x+20)
=(x+1){x(x+2)+10(x+2)}
=(x+1){(x+2)(x+10)}
=(x+1)(x+2)(x+10)
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