Answer
Geometric with ratio $r=2$
Work Step by Step
$ -6, -12, -24, -48, -96, -192, ... $
$\frac{a_2}{a_1}=\frac{-12}{-6}=2=r$
$ra_2=-24=a_3$
$ra_3=2\times(-24)=-48=a_4$
$ra_4=2\times(-48)=-96=a_5$
and so on. The sequence is geometric with common ratio $r=2$.