Question

.

Answer 1

\[\Large\begin{array}{r|r}n&a_n\\\hline1&3\\\hline2&-6\\\hline3&12\end{array}\]

Answer 2

Find the common ratio first.

Answer 3

Common ratio = a2/a1 = a3/a2 = a4/a3 = ...

Answer 4

-2 is the common ratio?

Answer 5

Yep

Answer 6

The explicit formula of a geometric sequence with first term \(a\) and common ratio \(r\) is:
\[\Large a_n=ar^{n-1}\]

Answer 7

\(a\) is not 1, and please treat \(a_n\) as one entity (sorry for being confusing about a_n)

Answer 8

Yep :)

Answer 9

Again, please treat \(a_n\) as one entity and leave it there (I apologize again for confusing you)

Answer 10

Because \(a_n\) means the \(n\)th term.

Answer 11

Yes this is right

Answer 12

Yep :)