Question

in matrix find the value of a + b + C whole square

Answer 1

✍✍HERE IS YOUR ANSWER..⬇⬇
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$\underline{ANSWER}$ ➡

$\boxed{( a+ b+c ) {}^{2} =a {}^{2} +b {}^{2} +c {}^{2} + 2ab + 2 bc+ 2ca}$

$\underline{SOLUTION}$ ➡

$Let ,\: \\ \\ b + c = x \\ \\ Then, \\ \\ ( a+b + c) {}^{2} \\ \\ = (a + x) {}^{2} \\ \\ = a {}^{2} + 2ax + x {}^{2} \\ \\ = a{}^{2} + 2a(b + c) + ( b+c ) {}^{2} \\ \\ = a {}^{2} + 2ab + 2 ca+ ( b{}^{2} + c{}^{2} + 2bc) \\ \\ = a{}^{2} + b{}^{2} + c{}^{2} + 2 ab+ 2bc + 2ca$

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