Expand the following using the identies
(7pq-4ab)2
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The answer is above dear .
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identity : (a-b)^2 = a^2 -2ab +b^2
a= 7pq
b= 4ab
(7pq)^2 -2(7pq) (4ab) +(4ab) ^2
49p^2q^2 -56pqab + 16a^2b^2
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