[tex] \bf 1)~\hspace{7em}
\begin{array}{|l|ll}
\cline{1-1}
~\hfill \sqrt{x}=9~\hfill \\
\cline{1-1}\\
\pm \sqrt{x}=9\\\\
\sqrt{x}=\mp 9\\\\
~\hfill \text{\huge -9}~\hfill\\\\
\cline{1-1}
\end{array}
\\\\[-0.35em]
\rule{34em}{0.25pt} [/tex]
[tex] \bf 2)
\\\\\\
\textit{area of a square}\\\\
A=s^2~~
\begin{cases}
s=length~of\\
\qquad a~side\\[-0.5em]
\hrulefill\\
A=4840
\end{cases}\implies 4840=s^2\implies \sqrt{4840}=s
\\\\\\
69.57\approx s~\hspace{5em}\boxed{69}\rule[0.35em]{7em}{0.25pt}\stackrel{\sqrt{4840}}{69.57}\rule[0.35em]{9em}{0.25pt}\boxed{70} [/tex]
