Just a little queations really

Now i can prove that is irrational, can i just say that is irrational with no extra proof?

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- Aug 12th 2009, 01:23 PMRapid_WProve sqrt(50) irrational
Just a little queations really

Now i can prove that is irrational, can i just say that is irrational with no extra proof? - Aug 12th 2009, 01:38 PMalunw
I'd be convinced, but it is perhaps even more obvious if you do things the other way around. If were rational then you would have = so that then would be rational as well.

- Aug 12th 2009, 01:39 PMred_dog
Suppose that is rational.

Then , contradiction. Therefore, the supposition is false and is irational. - Aug 12th 2009, 01:46 PMRapid_W