Answer:
0, 1, and 4
Explanation:
Since the denominator of a fraction must not be 0 or it would be undefined, when the denominator is 0 is where you will find your restrictions:
![x^3-5x^2+4x=0 \\\\x(x^2-5x+4)=0 \\\\x(x-1)(x-4)=0](https://img.qammunity.org/2021/formulas/mathematics/middle-school/7py01uhlm1j3wt753n9x8nh0bbp6fv2g5g.png)
Therefore, by the zero product property, the restrictions are 0, 1, and 4. Hope this helps!