None required, the square of a real number is positive, so no real number has a negative square, hence no rational has a negative square.
If you mean show that there is no rational x such that x^2=2 then see the Wikipedia article.
CB
None required, the square of a real number is positive, so no real number has a negative square, hence no rational has a negative square.
If you mean show that there is no rational x such that x^2=2 then see the Wikipedia article.
CB