Question

If a+b+c = 9 and ab+bc+ac = 23 find the value of a^2+ b^2 +c^2

Answer 1

use formula

(a+b+c)² = a² +b² +c²+2ab+2bc+2ac

a²+b²+c² = (a+b+c)² - 2(ab+bc+ac)

now, put given values in it

Answer 2

Step-by-step explanation:

(a+b+c)²= a²+b²+c²+2(ab+bc+ca)