\documentclass[10pt]{standalone}
\usepackage{pgfplots}

\begin{document}
	\begin{tikzpicture}
		\begin{axis}[
			axis lines = box,
			grid=both,
			xlabel = $x$,
			ylabel = $T_7(x)$,
			]
			\addplot [
			domain=-1.05:1.05, 
			samples=100, 
			color=black,
			]
			{64*x^7 - 112*x^5 + 56*x^3 - 7*x};
		\end{axis}
	\end{tikzpicture}
	
\end{document}