Question

pls answer this question
(3a-7b-c)²​

Answer 1

Answer:

Using the identity,

(a+b+c)² = a²+b²+c²+2ab+2bc+2ac

Now, put the value on the formula and execute...

⇒(3a-7b-c)²= (3a)²+(-7b)²+(-c)²+2.3a(-7b)+2.(-7b)(-c)+2.3b.(-c)

⇒(3a-7b-c)² = 9a²+49b²+c²-42ab+14bc-6ac

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Answer 2

Step-by-step hop answer will be right