Question

X*x*x*...*x de 2009 ori =-1

Answer 1

$x^{2009}=-1=cos\pi+i\cdot sin\pi\Rightarrow x=cos\dfrac{\pi+2k\pi}{2009}+i\cdot sin\dfrac{\pi+2k\pi}{2009},\\\\unde\;k\in\{0,1,2,3,\ \ldots,\ 2008\}.\\\\Green\ eyes.$