Question

if a + b + C is = 9. and a b + BC + CA is = 40 then the value of a^ 2 + b^ 2 + c^2:
(1) 0
(2) 1
(3) 2
(4) 3
(5) other​

Answer 1

Answer:

the answer is option 2

Step-by-step explanation:

I hope you have already learned the formula..

(a+b+c)^2=a^2+b^3+c^2+2(ab+b c+ca)

9^2=a^2+b^2+c^2+2×40

81=a^2+b^2+c^2+80

81-80=a^2+b^2+c^2

1=a^2+b^2+c^2

Hope it help........