Hi, I want to maximize a simple function:

```
V=(140*h - 48*h*h + 4*h*h*h)
with h being
h>=0
h<=5
```

But MATLAB is throwing following error:

Illegal operation: {log-affine} - {log-affine}

Here is a plot

http://www.wolframalpha.com/input/?i=(140*h±+48*h*h+%2B+4*h*h*h),+for+h%3E0,+h%3C5

Is there a way to solve it with CVX?

```
cvx_begin gp
variables h
maximize (140*h - 48*h*h + 4*h*h*h)
subject to
h>=0
h<=5
cvx_end
```