Question 40428
<pre><font size = 4><b>Divide.

 21y<sup>5</sup> - 28y<sup>4</sup> + 14y<sup>3</sup> 
————————————————————
         7y

This is division by a monomial


There are three terms in the top, so begin by drawing
three lines:

——————   ——————   ——————       

Now put the signs of the terms between the lines:

                 
—————— - —————— + ——————
                       
Now copy the denominator 7y under every line:



—————— - —————— + ——————
  7y       7y       7y

Write the terms above the lines

 21y<sup>5</sup>     28y<sup>4</sup>     14y<sup>3</sup> 
—————— - —————— + ——————
  7y       7y       7y

Give 1 exponents to the y's in the bottoms

 21y<sup>5</sup>     28y<sup>4</sup>     14y<sup>3</sup> 
—————— - —————— + ———————
  7y<sup>1</sup>      7y<sup>1</sup>      7y<sup>1</sup>

Cancel the 7's into the numerators:
 
 3        4        2 
 <s>21</s>y<sup>5</sup>     <s>28</s>y<sup>4</sup>     <s>14</s>y<sup>3</sup> 
—————— - —————— + ———————
  <s>7</s>y<sup>1</sup>      <s>7</s>y<sup>1</sup>      <s>7</s>y<sup>1</sup>
  1        1        1


 3y<sup>5</sup>      4y<sup>4</sup>      2y<sup>3</sup> 
—————— - —————— + —————
 1y<sup>1</sup>      1y<sup>1</sup>      1y<sup>1</sup>


Subtract exponents to divide the y's

 3y<sup>4</sup>      4y<sup>3</sup>      2y<sup>2</sup> 
—————— - —————— + —————
  1        1        1

   3y<sup>4</sup> - 4y<sup>3</sup> + 2y<sup>2</sup>

Edwin
AnlytcPhil@aol.com</pre>