Simplify : (7 + 4)^2 - (7x-4y)^2
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product of (7x−4y) and (3x−7y)
(7x−4y) (3x−7y)
⇒(7x)(3x)−(7x)(7y)−(4y)(3x)+(4y)(7y)
⇒21x2−49xy−12xy+28y2
⇒21x2+28y2−61xy
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this is your answer bro
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