Question

If a plus b plus c is equal to 10 and a square plus b swuare plus c swuare os equal to 50 find the value of ab plus bc plus ca

Answer 1

Answer:

25

Step-by-step explanation:

given,

(a+b+c)=10;

(a^2+b^2+c^2)=50;

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

10^2 =50+2(ab+bc+ca)

100-50=2(ab+bc+ca)

ab+bc+ca=25