Question

Solve using the suitable identity (3a+b-c)^2

Answer 1

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Answer 2

Answer:

IDENTITY=>(a+b+c)^2=a^2 + b^2+c^2+2ab+2bc+2ca

$\\ here..... \\ a = 3a \: \\ b = b \\ c = - c \\ \\ = > (3a + b - c) ^{2} = (3a) ^{2} + (b) ^{2} + ( - c) ^{2} + 2 \times 3a \times b + 2 \times b \times ( - c) + 2 \times ( - c) \times 3a \\ = > 9a^2 + b^{2} + c ^{2} + 6ab - 2bc - 6ac$

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