Question

(3m+7n)² -84mn=(3m-7n)² verify

It is urgent ​

Answer 1

Step-by-step explanation:

[3m + 7n ]² - 84 mn = [3m-7n]²

9m²+42mn +49n²-84 mn = [3m-7n]²        [USING IDENTITY (a+b)² ]

9m² + 49n²- 42mn = 9m²+ 49n²- 42 mn  [USING IDENTITY (a-b)² ]

LHS = RHS

HENCE VERIFIED

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