Question

find the product of the following using suitable identity
(7a-9b) (7a-9b)​

Answer 1

Answer:

(7a-9b)²

49a²+81b²-126ab

Answer 2

Answer:

(7a - 9b)^2

[(a-b)^2 = a^2 + b^2 - 2ab]

therefore acc. to the identity,

(7a)^2 + (9b)^2 - 2 × 7a × 9b

49a^2 + 81b^2 - 126ab is the answer

Step-by-step explanation:

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