Answer
GCF=9$x^{2}$y
Work Step by Step
-18$x^{2}$y ; 9$x{3}$$y^{3}$; 36$x^{3}$y
-18$x^{2}$y = -1*2*3*3*x*x*y
9$x^{3}$$y^{3}=$ 1*3*3*x*x*x*y*y*y
36$x^{3}$y = 1*2*2*3*3*x*x*x*y
GCF=1*3*3*x*x*y= 9$x^{2}$y
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