Question

(a+b-c)^2+ (a-b+c)^2

Answer 1

$(a + b - c) {}^{2} + (a - b + c) { }^{2} \\ a {}^{2} + b {}^{2} + c {}^{2} + 2ab - 2bc - 2ca + a {}^{2} + b {}^{2} + c {}^{2} - 2ab - 2bc + 2ca \\ 2 {a}^{2} + 2 {b}^{2} + 2 {c}^{2} - 4bc$

Answer 2

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