documentclass{article}
usepackage{pgfplots}
usetikzlibrary{arrows}

begin{document}
begin{tikzpicture}
   begin{axis}[axis lines=middle,
     xmin=-2,xmax=5,ymin=-15,ymax=15,
     xlabel=$x$,
     ylabel={$y$},
     xtick distance=1
   ]

   addplot[smooth,color=blue,] {x^2-x+2};
  end{axis}
end{tikzpicture}
end{document}