Question

find the indicated term of the indicated geometric sequence a1=-9 r=2 n=12
a.-2178
b.-18432
c.-1296
d.36863

Answer 1

Using the formula,
\[a_n=a_0\cdot r^{n-1}\]
Then.
\[a_{12}=-9\cdot2^{12}=-18432\]
So b is the correct answer.