Question

(a+b+c)² +(a-b+c)² +(a+b-c)²

Answer 1

Hey friend,
Mahak here,
Here is the answer you were looking for:
=a^2 + b^2 + c^2 + 2ab +2bc + 2ca + a^2 + b^2 + c^2 - 2ab - 2bc + 2ca + a^2 + b^2 + c^2 + 2ab -2bc - 2ca

= a^2 + a^2 + a^2 + b^2 + b^2 + b^2 + c^2 + c^2 + c^2 + 2ab -2ab +2ab + 2bc - 2bc - 2bc + 2ca + 2ca - 2ca

= 3a^2 + 3b^2 + 3c^2 + 2ab -2bc + 2ca

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