Question

if a+b+c= 6,a square+b square+cx square =14 then ,ab+bc+ca=​

Answer 1

Answer:

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

6^2=14+2(ab+bc+ca)

36=14+2(ab+bc+ca)

36-14=2(ab+bc+ca)

22=2(ab+bc+ca)

22/2=ab+bc+ca

ab+bc+ca=11(Ans)