Find the local maximum and minimum values and saddle point(s) of the function. If you have three-dimensional graphing software, graph the function with a domain and viewpoint that reveal all the
Important aspects of the function. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.)
F(x,y)=x³+y³-3x²-6y²-9x

local maximum value(s)=
local minimum value(s)=
saddle point(s)=