Question

If a + b+ c =4 and a^2+b^2+c^2=14 find ab +bc+ca
pls give me write answer of this ​

Answer 1

Answer:

(a+b+c)²= a²+b²+c²+2(ab+bc+ca)

4²=14+2(ab+bc+ca)

=>2(ab+bc+ca)=2

=>ab+bc+ca=1

Answer 2

Answer:

ab+bc+ca=1

See producer for the given answer in below attachment