Help with maths

I have a test tomorrow and I can't even simplify this:

 

.......

 

Simply by rationalizing the denominator;

Did in one step assuming you know that: (a+b)^2=a^2+2ab+b^2
And that; (a+b)(a-b)= a^2-b^2
If you didn't understand or couldn't read my writing feel free to pm

 

Hopefully your test went okay. In the future pm me and direct me to the thread. I'll help out unfortunately I didn't see this in time.

 

I can help with any math in the future!