Question

if a^2+ b^2+ c^2 is equal to 209 and ab + bc+ ac= 26 find the value of a + b + c​

Answer 1

Step-by-step explanation:

hope it will help u.....

Answer 2

Answer:

Using formula,

(a+b+c)²=a²+b²+c²+2(ab+bc+ca)

just put the value

(a+b+c)²=209+52

(a+b+c)²=261

a+b+c=√261=16.15 ≈16(appx.)