Question

Simplify (-a + b + c)² + ( a - b + c)^2 + (a + b - c)^2.
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Answer 1

Answer:

(-a+b+c)^2= a^2+b^2+c^2-2ab-2ca+2cb

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

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

now adding those three 3(a^2+b^2+c^2)-2ab-2bc-2ca

Answer 2

hope it helps.......