Question

if a+b+c=10 and ab+bc+ca=21 then find a²+b²+c²= ?​

Answer 1

Answer:

52

Step-by-step explanation:

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

10*10-2*21= a^2 +b^2+c^2

52 is your required answer.