Question

if a square + b square + c square = 20 and AB+ BC + CA is equal to 3 find a + b + c
URGENT GIVE ANSWER FAST

Answer 1

a square +b square+c square =20
ab+bc+ca=3
then (a+b+c) whole square =a square +b square +c square +2(ab+bc+ca)=20+2(3)=26
So, a+b+c=
$\sqrt{26}$

Answer 2

your answer is√ 26. take a look at picture.