F(x,y) = (2*y+1)*e^(x^2-y) Find critical point and prove there is only one. Use second derivative test to determine nature of crit. pt. I know the procedure in solving it: set partial derivatives to zero and solve resulting equations. And by second derivative test, if D>0, f(a,b) is local min/max; D<0, (a,b) is saddle point. if f_xx(a,b)>0, f(a,b) is min where D=D(a,b)=f_xx(a,b)f_yy(a,b)-f_xy(a,b)^2 I have no idea how to get the partial derivatives and start the problem. Any help will be appreciated, thanks.