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2015-06-08T21:08:36+08:00

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[(x+y)-5]²
This is a special product since (a-b)² = a²-2ab+b²

So:
[(x+y)-5]² = (x+y)²-2(x+y)(5)+5² = (x+y)²-10x-10y+25
(x+y)² is a special product in which it is equal to x²+2xy+y²

Therefore the answer is x²+2xy+y²-10x-10y+25
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