Answer:
12X^-3
Explanation:
12X^15 / 3X^12 = 0. The properties of exponents would say that we have to subtract the exponents in division, but we need the same bases first. In order to get the bases the same we need to divide both sides by 1/4. That will make 12 stay 12 and 3 become 12. Now we subtract the exponents using the properties of exponents with the same base. We end up left with 12x^-3.
I apologize if I made an error. I would be careful since I'm not to sure about my answer myself.