# How is this simplified?

b^2-a^2
-----------
b-a

simplifies to a+b

I didn't think I could simply divide because of the subtraction.
Is that how this is simplified ?
If not then please give me a bump in the right direction.

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expand this for me ...

$$(a^2-b^2)=???$$

"Difference of squares ..."

Find out what you get by multiplying b-a and b+a.

do you know polynomial division? (btw, your result is valid only when a is not equal to b)

Argggh!! Thanks everyone!