Question: Basic algebra manipulation of individual terms in a polynomial

First, this is not a homework assignment.  I am evaluating Maple as a replacement for a paper notebook since I never seem to have one at hand when I want one.  I want to be able to do algebra but seemingly at a finer level of detail than factor, collect, simplify, and expand seem to offer.  Here is what seems like a very simple example that I cannot crack:

(x-a)2-2a(x-a)

should simplify to 

x2 - a2

No matter what try with factor, collect, simplify, sort, and expand, I cannot get it past

x2 - 2xa + a2 + 2a(x - a)

How can I get maple to expand and collect specific terms in an expression?

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