Ensuring that vertical space is consistent in list of polynomials

Question

\documentclass{article}
\usepackage[fleqn]{amsmath}
\usepackage{mathrsfs}
\usepackage{amsfonts}
\pagestyle{empty}
\setlength\mathindent{0pt}
\begin{document}
\[3x^3\]
\[3x^2\]
\[3x\]
\[3\]
\end{document}

When I render this document, there is a lot more space between the first two options than between the second and third options. Is there a way to make sure it's consistent? Thanks!

Answer 1

Use gather* to put several equations after each other.

\begin{gather*}
3x^3\\
3x^2\\
3x\\
3
\end{gather*}