2
$\begingroup$

Possible Duplicate:
$a^{1/2}$ is either an integer or an irrational number

I know how to prove $\sqrt 2$ is an irrational number. Who can tell me that why $\sqrt 3$ is a an irrational number?

  • 6
    How about showing your proof for $\sqrt 2$ so you can be guided on how to modify that proof for $\sqrt 3$?2011-09-15
  • 1
    Nobody seems to have posted it, so: consider applying the rational root theorem to the polynomial $x^2-3$...2011-09-15

7 Answers 7