SOLUTION: Prove that no number of type 4k+1 be a perfect square.

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Question 278730: Prove that no number of type 4k+1 be a perfect square.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
Sorry but it is not true.
4k+1 can be a perfect square
if k=2 then 4*2+1=9 which is a perfect square.