Question

(7a+b)^2-2(7a+b)(7a-b)+(7a-b)^2

Answer 1

(7a+b)^2-2(7a+b)(7a-b)+(7a-b)^2

{(a-b)^2=a^2-2ab+b^2}

therefore,

[(7a+b)-(7a-b)]^2

Answer 2

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