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Question
Use a suitable identity to get the following products.
(7a − 9b) (7a − 9b)
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Solution
(7a − 9b) (7a − 9b) = (7a − 9b)2
= (7a)2 − 2(7a)(9b) + (9b)2 [(a − b)2 = a2 − 2ab + b2]
= 49a2 − 126ab + 81b2
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