Question

ab+bc+ca=36 and a²+b²+c²=85 then find a+b+c

Answer 1

hey mate here's ur ans ↓↓

=(a+b+c)^2
=a^2+b^2+c^2+2ab+2bc+2ca
=85+2(36)
=72+85
=157
Now,a+b+c=√157
a+b+c=12.599....

hope it helps u☺☺✌

Answer 2

(a+b+c)^2 = a^2 + b^2 + c^2 + 2(ab+bc+ac)
                 =85+2(36)
                  = 85 + 72
                   157
(a+b+c) = root of 157