Question

if a²+b²+c²=15 and ab+bc+ca=5 then find the value of (a+b+c+)²

Answer 1

Answer:

(a+b+c+)²= a²+b²+c²+2ab+2bc+2ca

= a²+b²+c²+ 2(ab+bc+ca)

put the value of a²+b²+c²=15 and ab+bc+ca=5

15+ 2 × 5 = 15 + 10 = 25

here is your answer please mark me as brainliest