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Question:
Factor x2 + 2xy + y2
Answer:
(x + y) (x + y), which is the same as(x + y)2
(x + y) (x + y), which is the same as
(x + y)2
Check it by multiplying it out, and you'll see it's right.
The webmaster and author of this Math Help site is Graeme McRae.