MATLAB: SOLVE command with SYMS

MATLABSymbolic Math Toolbox

Hi,
I have the Symbolic Math Toolbox. However, I can't even perform the following operation, which is copied and pasted from the Mathworks website on the usage of Symbolic Math Toolbx.
   syms x
   solve(x^2 + 4*x + 1 == 0)
The error says the following:
   ??? Input argument "x0" is undefined.
   Error in ==> solve at 56
   x=x0;
This isn't really what I'm trying to do. I have a system of non-linear equations and I get a whole different error messages, but the fact that I can't even perform a simple solving operation such as the above makes me think that there's something fundamentally wrong.
Can you please help me?
Thanks,
Eric

Best Answer

   syms x
   solve(x^2 + 4*x + 1)
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