Math
posted by casey .
I have solved the following and I am writing just their answers with it, please let me know if these are correct. thanks
1. Simplify, and write in the base of 3: (9^x . 3^4x)^2
answer: 3^12x
2. Differentiate and simplify
y= (e^x  1) / x^2
answer: (xe^x  2e^x +2) / x^3

Are these different from the previous posts?
http://www.jiskha.com/display.cgi?id=1332623656