Arjun tried to evaluate $(-a)^2$ where $a = -8$.
$\qquad\begin{align}
&(-a)^2\\\\
\\
=&(-(-8))^2&\green{\text{Step } 1}\\\\
\\
=&(8)^2&\blue{\text{Step } 2}\\\\
\\
=&81&\purple{\text{Step } 3} \\\\
\end{align}$
**Find Arjun's mistake.**
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