Answer:
we have :
(a+b+c)² = a² + b² + c² + 2(ab+bc+ca)
a+b+c= 9
and
ab+bc+ca = 26
Substituting the values in the above formula,
We get,
9² = a² + b² + c² + 2×26
81 = (a² +b² +c²) + 52
(a² +b²+c²) = 81-52
(a²+ b² + c²) = 29 is a required answer.
