I would like to use align inside of itemize as an item, but without a newline. How can I do this?
MWE
\documentclass[a5paper]{scrartcl}
\usepackage{amssymb, amsmath} % needed for math
\usepackage[utf8]{inputenc} % this is needed for umlauts
\usepackage[ngerman]{babel} % this is needed for umlauts
\usepackage[T1]{fontenc} % this is needed for correct output of umlauts in pdf
\usepackage{geometry}
\begin{document}
\begin{itemize}
\item ba dfasdfasd sadf
\item asdfa sd $x^2$ asdfasdf
\item \begin{align*}
x^2 + 2x -10 &= 31\\
\Leftrightarrow x^2 +2x + 21 &= 0\\
\Leftrightarrow (x+1)^2+20 &= 0
\end{align*}
\item adfasd asdfas
\end{itemize}
\end{document}
Results in:

It seems to me that there is also a newline after align or at least more whitespace than there should be. If it is possible, I would like to remove that, too.