! Missing number, treated as zero., ! Undefined control sequence., ! File ended while scanning use of pgfmath@dimen@@. LaTex

i’m trying to graph this function

 documentclass{article}
 usepackage{tikz}
 usepackage{mathtools}
 usepackage{pgfplots}
 pgfplotsset{compat=1.15}
 begin{document}
 begin{figure}
 centering
 begin{tikzpicture}
 begin{axis}[
 domain= 0:2,
title= Grafica en LaTex,
    xlabel=$eje x$
    ylabel=$Eje y$
ymin=1, ymax=14,
xmin=1, xmax=1.92,
]
addplot{(x^{frac{5}{2}}) + (3x^{frac{13}{10}}) +2};
end{axis}
end{tikzpicture}
end{figure}
end{document} 

I keep getting "Undefined control sequence.", "! File ended while scanning use of pgfmath@dimen@@."