Using a suitable identity solve the following (7a-9b)(7a-9b)
1 answer:
Answer:
49a^2 - 126ab + 81 ^2
Step-by-step explanation:
Suitable identity = (a-b)(a-b) = a^2 - 2ab + b^2
So, to solve this.
(7a-9b)(7a-9b) = 49a^2 - 126ab + 81b^2
Hope this helps
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