Factorise:X^2+9x+18
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x^2+9x+18= x^2+ 6x+3x+18= x(x+6)+3(x+6)= (x+3) (x+6)
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X^2+9x+18
=x^2+6x+3x+18
=x(x+6)+3(x+6)
=(x+3) (x+6)
=x^2+6x+3x+18
=x(x+6)+3(x+6)
=(x+3) (x+6)
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