We are asked to write a polynomial with the following characteristics:
1. 6th degree, this means that the maximum exponent must be 6
2. two double roots, this means it must contain two elements of the form:

3. Negative orientation. This means that it must be multiplied by a constant k < 0.
Therefore, a polynomial with such characteristics could be:

The graph of this polynomial is the following:
According to the graph:

and

It has degree 6 and the orientation is negative