Answer
$a_{5} = 648$
Work Step by Step
$a_{1} = 8$
$r = -3$
$a_{n} $ of geometric sequence is $a_{n} = a_{1} . r^{n-1} $
To find fifth term, substitute $a_{1} ,$ $r$ values and $n=5$
$a_{5} = a_{1} . r^{5-1} $
$a_{5} = a_{1} . r^{4} $
$a_{5} = 8 \times(-3)^{4} $
$a_{5} = 8 \times 81 $
$a_{5} = 648$
