General functional notation (e.g. h(x) ) is not supported. If you wish to draw a function or solve for x, for example as h(x) = x^2, replace h(x) with y (or any other unused variable).

In you case, if you replace h(x) with y and select Solve for 'x' you will get the following solution.

Click here to see the step by step solution. You can obtain an explanation for any step by clicking on it. Please note that you cannot click on the very first expression, which is the original problem.