Answer
6(x+2y)(x+y)
Work Step by Step
6$x^{2}$+18xy+12$y^{2}$=6($x^{2}$+3xy+2$y^{2}$)=
6($x^{2}$+xy+2xy+2$y^{2}$)=6[x(x+y)+2y(x+y)]=
6(x+2y)(x+y)
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