Question

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

Answer 1

Step-by-step explanation:

(a+b+c)²=a²+b²+c²+2(ab+bc+ca)

(9)²=a²+b²+c²+2(26)

81=a²+b²+c²+52

81-52=a²+b²+c²

29=a²+b²+c²