Respuesta :

8x^3y^2 = 4x^2y^2 (2x)
20x^2y^4 = 4x^2y^2 (5y^2)

GCF = 
4x^2y^2
First, add the two together. 

8x3y2+20x2y4=28x5y6

The GCF is 1, because 5 is a prime number that isn't divisible by anything but 1.

GCF=1
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