Question

if (a - b + c)² = a² + b² + c² + k a b -2 BC + 2 AC write the value of k.`​

Answer 1

Answer:

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

so k=-2

Answer 2

YES YOUR ANSWER IS. -2 plz MARK ME BRAINLEAST