Question

if a+b+c = 9 and ab+bc+ca=26 find a^2 + b^2 +c^2​

Answer 1

Answer:

Step-by-step explanation:

(a+b+c)² = a²+b²+c²+2ab+2bc+2ca

(9)² = a²+b²+c²+2(26)

81 = a²+b²+c²+52

a²+b²+c² = 81-52 = 29