Question

19. If a2 + b2 + C2 = 35, ab + bc + ac = 23, find the
value of a + b + c.​

Answer 1

Answer:

9

Step-by-step explanation:

(a+b+c)²=a²+b²+c²+2(ab+bc+ca)

(a+b+c)²= 35+2×23

(a+b+c)²= 35+46

(a+b+c)²= 81

a+b+c = √81

a+b+c = 9

.......666......