I am trying to study for the accuplacer, but I am not understanding the steps to get the answers to some problems.
1. solve for n: a2+n+2b2=(a+b)(a+2b)
2. (x3y5-xy4+x2y2) / (xy)
3. (x5y7-xy4) / (xy)
Any help is appreciated! If there are any links that might help me to understand these questions is welcomed too.