Question 760674
Since the leading coefficient is 1, you just list all the possible factors (plus/minus) of the last term 4


They are -1, 1, -2, 2, -4, 4


So the answer is highlighted in <font color="red">red</font> below


<font color="red">1. {±1, ±2, ±4}</font>
2. No answer is correct.
3. {1, 2, 4}
4. {±1, -2}