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Simplifying exponential functions

Need to simplify:

I know that y0= 1 and x½ = √x

which leaves me with -x²y²
But then I am stuck.  
Thanks for helping.  

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Anthony B. | Math, Stats, Calculus, APA TutorMath, Stats, Calculus, APA Tutor
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Hello John,
You are correct that y0 and that x1/2=√x.  However, in this type of problem, it is best not to convert to a square root at this step. Instead, beginning from this point:
The rule is that if you are dividing a variable, we subtract the values for their exponents.  This means that:
So we end up with the final answer of -x3/2y2
This form is generally considered the most simplified form, but if you want to express it with the square root, you can also call it: