\begin{equation}(x-4)(x-9)=0\end{equation}

\begin{equation}5(x-1)x=0\end{equation}

\begin{equation}(2x-2)(x-9)=0\end{equation}

\begin{equation}(x+5)(x-5)=0\end{equation}

\begin{equation}(3x-7)(3x-10)=0\end{equation}

\begin{equation}x^{2}+11x+28=0\end{equation}

\begin{equation}x^{2}=(-11)x-28\end{equation}

\begin{equation}x^{2}+8x+16=0\end{equation}

\begin{equation}16x^{2}-81=0\end{equation}

\begin{equation}-(x^{2}+5x-36)=0\end{equation}

\begin{equation}(-10)(x^{2}+4x-32)=0\end{equation}

\begin{equation}9x^{2}+27x+70=0\end{equation}

\begin{equation}-(2x^{2}+17x-28)=0\end{equation}

\begin{equation}3(9x^{2}+3x-36)=0\end{equation}

\begin{equation}10(x^{2}-49)=0\end{equation}

\begin{equation}10(100x^{2}+60x+9)=0\end{equation}

\begin{equation}1000x^{2}=640\end{equation}

\begin{equation}(-7)(x^{2}-14x+49)=0\end{equation}

\begin{equation}36x^{2}-12x+1=0\end{equation}

\begin{equation}7(16x^{2}+8x+1)=0\end{equation}

\begin{equation}9(64x^{2}-16x+1)=0\end{equation}

\begin{equation}9(x^{2}+18x+81)=0\end{equation}

\begin{equation}100x^{2}=(\frac{2}{9})^{2}\end{equation}