Question 53834
<pre><font size = 5><b>
  (2x² + 5xy + 4y²) + (-xy - 6x² + 2y²)

Try putting the second one under the first one, like
this:

   (2x² + 5xy + 4y²)
 + (-xy - 6x² + 2y²)
---------------------

No, that won't do.  We'll have to swap the first two 
terms of the second one so like terms will be in line 
vertically.  Now we can add them:

   ( 2x² + 5xy + 4y²)
 + (-6x² -  xy + 2y²)
---------------------
    -4x² + 4xy + 6y²

Edwin McCravy</pre>