Question

prove that a²+b²+c²-ab-bc-ca is always a non-negative for all the values of a, b and c

Answer 1

Answer:

let a=2 b=4 c=6

(2) square+(4) square+(6) square-2(4)-4(6)-6(2)

4+16+36-8-24-12

56-8-24-12

56-28

=28

non negative value

hence proved