Question

) If a + b + c = 9and ab + bc + ca = 26, find a² + b2 + c2.​

Answer 1

Answer:

(a+b+c)² = a²+b²+c²+2(ab+bc+ac)

(9)² = a²+b²+c²+2(26)

81-52=a²+b²+c²

a²+b²+c² = 29

hope it helps...

Answer 2

Refer to the attachment :-)