Notice it doesn't completely go down to the x-axis.
It can be partially fixed with this
but due to bugs in earlier versions of maple I can only achieve this
The missing area in the positive side y area has been fixed in newer versions of maple, however the jagged areas in the negative side are still there. If I use 1 + sqrt(25-x^2-y^2) instead it is okay in newer versions of maple (that is the fixed missing area in + y and the jagged areas) it graphs the semi sphere.
Even -1+sqrt(25-x^2-y^2) works. So something is happening when the graph is trying to be drawn at z=0. Any ideas? workarounds? is it a bug?