calculate (transpose(x)*A*x ) where x=
find the set of values for k where (transpose(x)*A*x ) > 0 for all non zero x in R^2
I am having real difficulty on this one, as when i did this calculation i got:
5kx1^2 + 10x1x2 + x2^2
Now it says for non-zero x but that means they can still be negative? Please help.