Question: Why does maple display my solution in terms of variables instead of solving my maximalization equation?

Dear members,

I am trying to solve a maximalization problem, but in stead of solving my problem Maple only displays the equation that I am trying to solve.

Example:

>  Sigma_max:= maximize(-N/(b*h)+(-EI*(diff(u(x),x,x)))*0.5*h/I, x=0..l = sigma_t;

sigma_max:=maximize(-0.400000cos(0.25pi)N+564e*N*x .....etc...., x = 0..250)=1.43 10⁶

>  N_sol:=solve(sigma_max,N);

warning, solutions may have been lost

N_sol:=RootOf(maximize(3545454_Z(654654654esinx)....etc....), x=0..250)-1430000)

Where b,h,EI,I,l,sigma_t are constants and diff(u(x),x,x) is a function of the variables N and x

So instead of solving this equation, Maple displays the solution as a function of the variables that I am trying to solve.

Is there a way around this?

Thanks