Neither of you is correct. The real zeros of this polynomial are 1 and 4.
The easiest way to see this is by using the quadratic formula.
If you have a polynomial in the form of
In this case
Plugging this in the formula you get:
So remember this formula:
There is no answer, where there is no question.
If the question is: "Evaluate
If the question is: "For what value of
If the question is something else, (Like where is the vertex of