Prove that there is no rational number x such that x^2 = -1.
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Originally Posted by noles2188 Prove that there is no rational number x such that x^2 = -1. 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.
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