Question

If a + b + c = 0, then a2 + ab + b2 is equal to?

Please help​

Answer 1

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If a + b + c = 0, then, a² + b² + ab = ?

Then,

a + b = - c

On squaring both sides, we get:

⇒ (a + b)² = c²

⇒ a² + 2ab + b² = c²

⇒ a² + b² + 2ab =  c²

⇒ a² + b² + ab = c² - ab

Answer : c² - 2ab

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