I realize this has been asked before, so I apologize for the "repeat". I saw [this](https://blender.stackexchange.com/questions/607/generate-curve-from-equation/609) answer, and it mostly solved my issue. However, I can't figure out how to generate my specific equation. This is my equation:

[![enter image description here](https://i.stack.imgur.com/E9BbN.png)](https://i.stack.imgur.com/E9BbN.png)

This works from the range -1 <= x <= 1. For the really big equation, the "x" should actually be z, and the "h" should be x (I had to use those to graph it on Desmos). In any case, I tried inputting the first half of the equation with the Blender Add Mesh: Extra Objects > Math Function > Z Math Surface by typing this:

```
(sqrt(-16*fabs(x)+40*sqrt(fabs(x))*y-16*pow(x,2)-25*pow(y,2)+16)+15*x)/15

```

The result is an error evaluating the expression. Do I have to set the range somehow? Would it be better to use XYZ Math Surface? (and if so, how?). Or am I just doing something wrong? Thank you in advance.