Plz help quick need answer

How many zeros does the function f(x)=4x3-x2+1 have

I'll give brainliest if you answer right : )

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.