The answer depends on whether it is 3x2 + 3y2 or 3x2 - 3y2.
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The GCF is 3y2
3x2+6xy+3y2= 3(x2+2xy+y2)= 3(x+y)2
3X2 + 6X + 9 3(X2 + 2 + 3) -----------------------3 is a common factor of all terms
(3y2)4*3y2*3y2*3y2*3y2 = 38*y16 = 6561y16
3xy + 3y2 = 3y (x + y)