\begin{equation}25x^{2}=49\end{equation}

\begin{equation}25x^{2}+10x+1=0\end{equation}

\begin{equation}x^{2}+36=0\end{equation}

\begin{equation}x^{2}+20x+100=0\end{equation}

\begin{equation}x^{2}+16x+68=0\end{equation}

\begin{equation}x^{2}+12x+32=0\end{equation}

\begin{equation}80x^{2}+18x+1=0\end{equation}

\begin{equation}30x^{2}+110x+80=0\end{equation}

\begin{equation}x^{2}+6x+2=0\end{equation}

\begin{equation}4x^{2}+4x-6=0\end{equation}

\begin{equation}100x^{2}+80x+12=0\end{equation}

\begin{equation}81x^{2}+18x+8=0\end{equation}

\begin{equation}16x^{2}+56x+57=0\end{equation}