Question

If a+b+c=9 and a²+b ² + c =29
find ab+bc+ca​

Answer 1

Answer:

this the answer of questions

Answer 2

Answer 26

(a+b+c)2=a2+b2+c2+2ab+2bc+2ca

(9)2=29+2(ab+bc+ca)

81-29=2(ab+bc+ca)

52/2=ab+bc+ca

26=ab+bc+ca