Factorise x3+6x2+11x+6
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x^3+x^2+5x^2+5x+6x+6
=x^2(x+1)+5x(x+1)+6(x+1)
=(x+1)(x^2+5x+6)
=(x+1)(x^2+2x+3x+6)
=(x+1)(x+2)(x+3)
=x^2(x+1)+5x(x+1)+6(x+1)
=(x+1)(x^2+5x+6)
=(x+1)(x^2+2x+3x+6)
=(x+1)(x+2)(x+3)
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