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9【X+Y]^2-4[X-Y]^2
=[3(X+Y)]^2-[2(X-Y)]^2
=[3(X+Y)+(2(X-Y)][3(X+Y)-(2(X-Y)]
=(5X+Y)(X+5Y)
=[3(X+Y)]^2-[2(X-Y)]^2
=[3(X+Y)+(2(X-Y)][3(X+Y)-(2(X-Y)]
=(5X+Y)(X+5Y)
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