Question 330326
 Multiply 
[(x-2) - y] ^2 
Do you have to like square the whole thing ?
SO it would be like x^2-4x+4 - y^2 ? 
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What it's like is not the question.  You have to say what it is.
[(x-2) - y] ^2
= {{{(x^2 - 4x + 4) - 2y(x-2) + y^2}}}
= {{{x^2 - 4x + 4 -2xy + 4y + y^2}}}