7x²+18xy-9y²
5x²y²-5xy-360
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1. 7x^2+21x-3x-9y
7x (x+3) -3 (x+3)
(7x-3) (x+3)
2. ans is 25x2 - y2
because
(a+b) (a-b) = a2 -b2
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