Find the following using identity (7x-9y)-(7x-9y)
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using identity (x-y)^2 =x^2-2xy+y^2
= (7x)^2-2×7x×9y+(9y)^2
= 49x^2-12xy+81y^2
I hope you like it
= (7x)^2-2×7x×9y+(9y)^2
= 49x^2-12xy+81y^2
I hope you like it
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