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Question

Multiply using special products (7a - 8b)(2b + 7a)


Solution

We can not apply any identity in this question. If it was (7a - 8b)(7a + 8b) then we can apply (p+q)(pq)=p2q2
i.e. 49a264b2
Else we can (7a8b)(2b+7a)=(7a8b)(7a+8b6b)=(7a8b)(7a+8b)(7a8b)(6b)=49a264b242ab+48b2
=49a216b242ab

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