Question

a+b+c=12 and a2+b2+c2=50 find ab+bc+ca

Answer 1

this is the answer please make my answer as brain list answer

Answer 2

(a+b+c)^2=a^2+b^2+c^2+2 (ab+bc+ca)
(12)^2=50+2 (ab+bc+ca)
2(ab+bc+ca)=144-50
(ab+bc+ca)=94/2
=47