Question

5. If a2 + b2 + c2 = 35 and ab + bc + ca = 23;
find a + b + c.
C
TS
,​

Answer 1

Answer:

9

Step-by-step explanation:

(a+b+c)^2= a2 +b2+ c2+ 2(ab+bc+ac)

=35+2(23)

=35+46=81

(a+b+c)^2=81

a+b+c= √81

a+b+c= 9

Answer 2

Answer:

(a+b+c)2=a2+b2+c2+ab+bc+ca

a2+b2+c2=35

ab+bc+ca=23

so

(a+b+c)2=35+23

(a+b+c)2=58

now

a+b+c=square root of 58

that's the only answer