Question

if a+b+c = 7 and a²+ b² + c² = 27 . Find ab + bc + ca​

Answer 1

Answer:

(ab+bc+ca) = 11

Step-by-step explanation:

(a+b+c)² = a²+b²+c²+2(ab+bc+ca)

(7)² = 27+2(ab+bc+ca)

49-27 = 2 (ab+bc+ca)

22/2 = (ab+bc+ca)

11 = (ab+bc+ca)

∴(ab+bc+ca) = 11

please mark me as brainlist.............