Answer
$c^2-2c-3$
Work Step by Step
Using the FOIL Method, $(a+b)(c+d)=ac+ad+bc+bd$, the given expression simplifies to
\begin{align*}
&
(c-3)(c+1)
\\\\&=
c^2+c-3c-3
\\\\&=
c^2-2c-3
.\end{align*}
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