I am trying to minimize a function like the following:

```
a*x^4+b*y

```

and constraints like:

```
x^2 <= a

```

in [CGAL::Quadratic\_program](http://www.cgal.org/Manual/latest/doc_html/cgal_manual/QP_solver/Chapter_main.html#Section_10.3).

To input "x^2" in the objective function I can do the following:

```
qp.set_d(X, X, 2);

```

but what about "x^4" ?

To add a constraint like "x<=a":

```
hp.set_a(X, 0, 1);
hp.set_b(0, a);

```

but what about "x^2 <= a" ?