1.

Simplify : (7 + 4)^2 - (7x-4y)^2

Answer»

PRODUCT of (7X4Y) and (3X7Y)

(7x−4y) (3x−7y)

⇒(7x)(3x)−(7x)(7y)−(4y)(3x)+(4y)(7y)

⇒21x2−49xy−12xy+28y2

⇒21x2+28y2−61xy



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