Question

if a+b+c=9 and ab+bc+ca=26 , Find a²+b²+c² .

Answer 1

(a+b+c)2 =a2+b2+c2+ab+bc+ca

 (9)2=a2+b2+c2+26

 81-26=a2+b2+c2

 55=a2+b2+c

58



 (a+b+c)2 =a2+b2+c2+2(ab+bc+ca)

 (9)2=a2+b2+c2+2(26)

 81-52=a2+b2+c2

29=a2+b2+c2

Answer 2

heya here is ur answer!!!
ur answer is 29.
tq