Hello,

I am stuck and not sure I understand this part of my course, I'm working through some problems and this is one I'm stuck on;

heres the problem;

I have the Quadratic form f(x; y) = ax2 + 2bxy + cy2:

and the Matrix A

A =

a b

b c

:

I have (Lambda) and (Mew) as the eigenvalues of the Matrix A

I now have to demonstrate that

Lambda + Mew = a + c = tr(A)

Any help would be great

thanks