Question

If a+b+c=9 and ab+bc+ca=26 find a2+ b2+ c2

Answer 1

Answer:

-28

Step-by-step explanation:

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

=>( 9)2 = a2+b2+c2+ 2(26)

=>a2+b2+c2 = 52 - 81

= -28

Answer 2

Answer:

29

Step-by-step explanation:

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

(9)2= a2 +b2 +c2 + 2 (ab+bc+ca)

81=a2+b2+c2+2(26)

81= a2+b2+c2+52

81-52 = a2+b2+c2

29= a2+b2+c2

hope it helps

christin, your ans is wrong

pls mark as brainliest