Answer:
The given polynomial has 4 roots.
( may not be all distinct)
Explanation:
Fundamental Theorem of Algebra --
It states that every non-constant polynomial of degree n has exactly n roots counting multiplicity.
i.e. the roots may repeat.
i.e. the number of roots of a non-constant polynomial of degree n has atmost n distinct roots.
We are given a polynomial as:

Clearly the polynomial is of degree 4.
This means that the roots of this polynomial will be: 4
( not all roots may be distinct)