Hello,

you could expand it as follows :

Let's first expand . This is done by distributing :

Therefore :

Now apply the distributive law again :

Finally :

Does this help ?

PS : since I'm in a good mood I'll give you a nice website to check your results (if you don't know it already). It is called Wolfram Alpha, and you can type in what you want it to do (like "expand/factor/simplify [expression]", "solve [equation]"), and it will most likely do it correctly.