Determine whether the following sequence is geometric. If so, find the common ratio. 1, -4, 16, -64, . . .

Given:
Geometric sequence is:
1,-4,16,-64
Sol:
For geometric sequence is:
[tex]a_n=a_1r^{n-1}[/tex][tex]\begin{gathered} a_1=1 \\ a_2=-4 \end{gathered}[/tex][tex]\begin{gathered} a_n=a_1r^{n-1} \\ -4=1r^{2-1} \\ -4=r \end{gathered}[/tex]Common ratio is -4.