Answer:
Quintic polynomial is a polynomial with degree 5
Explanation:

Given polynomial has degree 5 . Its a 5th degree polynomial
Cubic polynomial has degree 3
Quadratic polynomial has degree 2
Constant is a polynomial with a number without any variable like 2 or 4 or 15
Quintic polynomial is a polynomial with degree 5. Given polynomial has degree 5 . So it is Quintic