Question 1116740
<pre>

It's done by special long division:

     <u>  x + x²/a + x³/a² + &#8729;&#8729;&#8729;</u> 
a - x)ax
      <u>ax - x²</u>
           x²   - x³/a²
                  <u>x³/a² -   </u> 

If you need further explanation, just ask in the note-form
below and I'll get back to you by email.

Edwin</pre>