Question

a+b+c=9 and ab+BC+CA=26 then find a2+b2+c2. To which standard this question belongs?

Answer 1

Answer:

43

Step-by-step explanation:

a+b+c=9          ab+bc+ca=26

(a+b+c)²=a²+b²+c²+2(ab+bc+ca)

      9²=a²+b²+c²+52

      a²+b²+c²=43

I think this belongs to algebraic identities

Answer 2

Answer:

Step-by-step explanation:

a+b+c)²=a²+b²+c²+2(ab+bc+ca)

9²=a²+b²+c²+52

a²+b²+c²=43

Hope you like my ans