What is the value of $ a^2 + b^2 +c^2 - 2ab =2bc +2 ca $ ?
Answer & explanation
Correct answer: option 4
We know that,
(a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca
(a - b + c)2 = a2 + b2 + c2 - 2ab - 2bc + 2ca
What is the value of $ a^2 + b^2 +c^2 - 2ab =2bc +2 ca $ ?
Correct answer: option 4
We know that,
(a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca
(a - b + c)2 = a2 + b2 + c2 - 2ab - 2bc + 2ca