Question

a+b+c=9 ab+bc+ca=26 A2+B2+c2

Answer 1

Hey mate !!
Here's your answer :))

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

9^2 = a^2+b^2+c^2+2*26
81=a^2+b^2+c^2+54
81-54=a^2+b^2+c^2
27 => a^2+b^2+c^2

Hope this helps☺☺

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