Actually you can completely get rid of the x & y terms on top.
Consider this:
right?
So you can cancel the top terms all together, you should get:
Go here http://www.mathhelpforum.com/math-he...-tutorial.html for LaTex typing info.
Just FYI, to make a fraction use:
\frac{x+2}{4+1} *then highlight it and click on the button on the taskbar \frac{x+2}{4+1}
If the exponent on the denominator was negative, you could just make it into another fraction in the denominator, by putting it under 1 and then changing the exponent to a positive number:
ex.
To simplify it, you would just multiply the top of the big fraction by the reciprocal of the bottom fraction:
Got it now?
****For square roots: \sqrt{number} then highlight it and click the button