factorise the following: xsquare+9x+18
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x^2+9x+18
=x^2+3x+6x+18
=x(x+3)+6(x+3)
=(x+3)(x+6)
=x^2+3x+6x+18
=x(x+3)+6(x+3)
=(x+3)(x+6)
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