Question

If a+b+c=0, then a + b²+ c²?​

Answer 1

Answer:

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a+b+c = 0

by squaring on both sides

a+b+c whole square = 0

a² + b² + c² + 2(ab+bc+ca) = 0

so answer is

➙ {- 2(ab+bc+ca)}

Answer 2

Answer:

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