Answer
$c=2$ and $c=4$
Work Step by Step
$(c-2)(c-4)=0$ Original problem.
$(c-2)=0$ and $(c-4)=0$ Set both factors equal to zero.
$c-2=0$ and $c-4=0$ Drop the parenthesis.
$c=2$ and $c=4$ Solve both mini-equations.
