Question

a + b + c equal to P and a b + BC + CA equal to Q find a square + b square + c square ​

Answer 1

Answer:

the anwer is (P)^2-2(Q)

Step-by-step explanation:

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

substituting values

(P)^2=a^2+b^2+c^2+2(Q)

(P)^2-2(Q)=a^2+b^2+c^2

a^2+b^2+c^2=(P)^2 - 2(Q)