4(3x+2y)^2- 9 (x-y)^2
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4(3x+2y)^2- 9 (x-y)^2
=[2(3x+2y)]^2-[3(x-y)]^2
={[2(3x+2y)]-[3(x-y)]}{[2(3x+2y)]+[3(x-y)]}
=(3x+7y)(9x+y)
=[2(3x+2y)]^2-[3(x-y)]^2
={[2(3x+2y)]-[3(x-y)]}{[2(3x+2y)]+[3(x-y)]}
=(3x+7y)(9x+y)
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