Rational Expression - Need Assistance

Hello,

I am working on the following problem.. It needs to be simplified... I apologize for the bad brackets, I am still trying to figure out how to use the equation editor in ms word and cannot figure out how to get the ------- for the fraction part in the brackets :-[

----- ----- ^1/2
| m^2 n^4 |
| ----------- |
| m^-2 n |
----- -----

anyways. here is what I have done so far...

m^2 - (m^-2) = m^4
n^4 - n = n^3

now I have ...

( m^4 n^3 ) ^1/2

I forget what to do with the fractional exponent?

Thank You

The brackets got really messed up when I posted it, I am sorry, it is supposed to be the middle part with the m's and n's

raised to the 1/2 power

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