9(x+2y)^2-25(x-2y)^2
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9(x+2y)^2-25(x-2y)^29(x+2y)^2-25(x-2y)^29(x+2y)^2-25(x-2y)^29(x+2y)^2-25(x-2y)^2=[3(x+2y)+5(x-2y)][(
9(x+2y)^2-25(x-2y)^2
9(x+2y)^2-25(x-2y)^2
9(x+2y)^2-25(x-2y)^2
9(x+2y)^2-25(x-2y)^2
=[3(x+2y)+5(x-2y)][(3(x+2y)-5(x-2y)]
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