Question

If a²+b²+c² = 14 and a+b+c = 7 , find ab+bc+ca​

Answer 1

Answer:

a+b+c=14 and a  

2

+b  

2

+c  

2

=74

(a+b+c)  

2

=a  

2

+−b  

2

+c  

2

+2(ab+bc+ca)

14  

2

=74+2(ab+bc+ca)

ab+bc+ca=  

2

196−74

​

=  

2

122

​

=61

Step-by-step explanation: