Answer
$W(x)=\;Ce^{-2x}$
Work Step by Step
We will use Abel's formula to find wronskian
${y}'''+2{y}''-{y}'-3y=0\\\\$
$p_{1}(x)=2\;\;\;\;\;\;\;\;\;\;\;$ coefficient of ${y}''\\\\$
$W(x)= Ce^{-\int p_{1}(x)dx}\;=\;Ce^{-\int 2dx}\;=Ce^{-2x}$
