\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
	\begin{bmatrix}
		1 & x & x^{2} \\
		1 & y & y^{2} \\
		1 & z & z^{2} \\
	\end{bmatrix}
\end{align}
\end{document}