If a, b and c are positive integers and if a=2b and a^2+b^2=c, which of the following cannot equal to c?
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c is 5 times a square number. Divide each of the possible answers by 5 and see which one isn't a square number.
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@.Sam. please save time and help
You have a relation between two of the three variables, so use it. You will be eliminating one of them in the process. Finally you get a simple expression, as solved above by a member. Try out all the given options and get to the correct answer.
DDCamp gave a really nice method, why am i being tagged?
Please stop tagging me. That was 12 notifications when I logged on JUST from you.