Question

if disriminant D=(fxx)(fyy)-(fxy)^2 equals to 0, what does it implies?

Answer 1

\[D(x _{0},y _{0})=f _{xx}f _{yy}-f _{xy}^{2}=0\]

Answer 2

it has only one real root?

Answer 3

as in, im using the D to analyse the point whether it is maximum, minimum or saddle point

Answer 4

oh...then i dunno..i hate calculus :P hahaha