Answer
$\begin{pmatrix}
4 & -52\\
-52 &676
\end{pmatrix}$
Work Step by Step
$AC=\begin{pmatrix}
-2\\
26
\end{pmatrix}$
$tr(AC)=\begin{pmatrix}
-2 & 26
\end{pmatrix}$
$(AC)(AC)^T=\begin{pmatrix}
4 & -52\\
-52 &676
\end{pmatrix}$
