ACOPS- NT problem
- bristy1588
- Posts:92
- Joined:Sun Jun 19, 2011 10:31 am
Find all $x$ such that $ x^2+ 2$ is a prime.
Bristy Sikder
Re: ACOPS- NT problem
It must say $x$ prime as well. Otherwise it is impossible to find. And then $x=3$ is the only solution since otherwise $x^2+2\equiv1+2\equiv0\pmod3$
One one thing is neutral in the universe, that is $0$.
Re: ACOPS- NT problem
Umm...actually $x=1,3$. And yeah, mod 3 will do the trick.
"Inspiration is needed in geometry, just as much as in poetry." -- Aleksandr Pushkin
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Please install LaTeX fonts in your PC for better looking equations,
learn how to write equations, and don't forget to read Forum Guide and Rules.
Re: ACOPS- NT problem
No. When you say $x$ is prime.
One one thing is neutral in the universe, that is $0$.