4x^2+9y^2+12xy factorise
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4x^2+12xy+9y^2
= 4x^2+6xy+6xy+9y^2
= 2x(2x+3y)+3y(2x+3y)
= (2x+3y)(2x+3y)
therefore
x=-3y/2
= 4x^2+6xy+6xy+9y^2
= 2x(2x+3y)+3y(2x+3y)
= (2x+3y)(2x+3y)
therefore
x=-3y/2
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