matrix.tex

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}

\title{Experiments with Matrices}
\author{Deepraj Pandey}
\date{July 2018}

\begin{document}

\maketitle

\section{Matrices lol}

\[
    \begin{bmatrix}
    0 & a \\
    -a & 0
    \end{bmatrix}
    + \alpha
    \begin{bmatrix}
    0 & b \\
    -b & 0
    \end{bmatrix}
\]
\end{document}