Question 22506
<pre><b> 54x<sup>6</sup>y<sup>-4</sup>z<sup>2</sup>
------------
 9x<sup>-3</sup>y<sup>2</sup>z<sup>-4</sup>
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Rule 1: If a negative exponential is a factor of the numerator,
move it from numerator to denominator and change the sign of the
exponent

Rule 2: If a negative exponential is a factor of the denominator, 
move it from denominator to numerator and change the sign of the 
exponent


 54x<sup>6</sup>y<sup>-4</sup>z<sup>2</sup>
------------
 9x<sup>-3</sup>y<sup>2</sup>z<sup>-4</sup> 

Since the x<sup>6</sup> already has a positive exponent, leave it where it is.
Move the y<sup>-4</sup> to the denominator and change the sign of the -4 
exponent to +4

   54x<sup>6</sup>z<sup>2</sup>
------------
 9x<sup>-3</sup>y<sup>2</sup>z<sup>-4</sup>y<sup>4</sup>

Move the x<sup>-3</sup> to the numerator and change the sign of the -3 exponent
to +3

 54x<sup>6</sup>z<sup>2</sup>x<sup>3</sup>
----------
 9y<sup>2</sup>z<sup>-4</sup>y<sup>4</sup>

Move the z<sup>-4</sup> to the numerator and change the sign of the -4 exponent
to +4

 54x<sup>6</sup>z<sup>2</sup>x<sup>3</sup>z<sup>4</sup>
------------
   9y<sup>2</sup>y<sup>4</sup>

Now that all exponents are positive, add the exponents of x<sup>6</sup> and x<sup>3</sup>, 
getting x<sup>9</sup>

  54x<sup>9</sup>z<sup>2</sup>z<sup>4</sup>
------------
   9y<sup>2</sup>y<sup>4</sup>

Add the exponents of z<sup>2</sup> and z<sup>4</sup>, getting z<sup>6</sup>

  54x<sup>9</sup>z<sup>6</sup>
----------
   9y<sup>2</sup>y<sup>4</sup>

Add the exponents of y<sup>2</sup> and y<sup>4</sup>, getting y<sup>6</sup>

  54x<sup>9</sup>z<sup>6</sup>
----------
    9y<sup>6</sup>

Divide the numerator and denominator by 9

  6x<sup>9</sup>z<sup>6</sup>
---------
    y<sup>6</sup>

Edwin
AnlytcPhil@aol.com</pre>