Question

if a+b+c=14, a^2+b^2+c^2=70. find ab+bc+ca

Answer 1

Answer:

63

Step-by-step explanation:

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

14^2=70+2(x)

x=196-70/2

x=63