\documentclass[a4paper,11pt,openany,oneside]{article}
\RequirePackage{tikz} 
\usepackage{pgfplots}
\usepackage{xepersian}
\setdigitfont[Scale=1.1]{B Yekan+}
\settextfont[Scale=1.1]{B Zar}
\begin{document}
\begin{tikzpicture}
	\begin{axis}[xmin=-2,xmax=4,ymin=-1,ymax=6,	]
		\addplot[thick,samples=30] {2^x};
		\addplot[thick,red,samples=30] {3^x};
		\addplot[thick,blue,samples=30] {4^x};
	\end{axis}
\end{tikzpicture}
\end{document}