Refer back to the problem if you need any assistance, by clicking here.
Suppose that 0 < a < b
then, 
Look below at another way to view this problem:
Since 
we know that 
or 
when
and 
.
Click here to see the animation of where a + b is held constant but b approaches a in size. Make sure to double click the animation button!
But first, take a look at a couple of pictures:
