(7a+b)^2-2(7a+b)(7a-b)+(7a-b)^2
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(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
amitnrw:
[(7a+b)-(7a-b)]^2 = (2b)^2 = 4b^2
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