Question

if a+b+c=6 and ab+bc+ca=10 then find a²+b²+c²​

Answer 1

Answer:

given a+b+c=6

ab+bc+ca=10

now

(a+b+c)^2=(6)^2

a^2+b^2+c^2+2(ab+bc+ca)=36

=> a^2+b^2+c2=36-2*10

=> a^2+b^2+c^2=16