15x2y2-9xy3
As x2y2 = x xy2 and xy3 = xy2 y then
xy2 is in both term you can first factorize
15x2y2-9xy3 = xy2(15x-9y)
as 15=3x5 and 9=3x3
15x2y2-9xy3 = 3xy2(5x-3y)
and that it !
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