MathOverflow is not for homework help.
Here is one suggestion for a comment template for homework (or homework-like) questions, which is a bit longer - it contains link to FAQ on meta and mentions other sites (the list of sites and the formulation are copied from FAQ).
MathOverflow is not for homework help. But there are lots of other math Q&A sites where your question might fit right in, like math.stackexchange.com, Ask Dr. Math, Art of Problem Solving, Physics Forums, NRICH.
[MathOverflow is not for homework help](https://meta.mathoverflow.net/questions/203/frequently-asked-questions-mathoverflow-faq/207#207). But there are lots of other math Q&A sites where your question might fit right in, like [math.stackexchange.com](https://math.stackexchange.com/), [Ask Dr. Math](http://mathforum.org/dr/math/), [Art of Problem Solving](http://www.artofproblemsolving.com/Forum/index.php), [Physics Forums](http://www.physicsforums.com/), [NRICH](http://nrich.maths.org/discus/messages/board-topics.html).