Question

Obtain the product of the following by using suitable  identities 7a – 9b )  ( 7a – 9b )​

Answer 1

Answer:

49a²+81b²-126ab

Step-by-step explanation:

  (7a-9b)(7a-9b)

⇒(7a-9b)²

We know that

(a-b)²= a²+b²-2ab

⇒(7a-9b)²=(7a)²+(9b)²-2(7a)(9b)

⇒49a²+81b²-126ab

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