90xy^3 = 2*3*3*5*x*y*y*y
12xy = 2*2*3*x*y
GCF = 2*3*x*y = 6xy
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The first example that comes to mind is that since 12xy is a factor of 36xy, you could use 12xy. This would have the GCF that you want. ■
(x + 5y)(x + 7y)
12xy * 3x = 36x2y
Rewritten additively.60X2Y + 84XY212XY(5X + 7Y)=============12XY----------greatest gcf
6xyz(3x + 2y + z)