It's a<sup>12-12</sup> = a<sup>0</sup> = 1. They're both the same answer; "1" is more simplified, though, and is thus probably what they are looking for.
Note: I am assuming that your work in your latest post reflects the actual text of the exercise. The numerator does not match what you posted originally. If the first post was correct, then the above is a bit off.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.