What is the sum of the geometric sequence –4, 24, –144, ... if there are 6 terms? How do I do this?

What is the sum of the geometric sequence –4, 24, –144, ... if there are 6 terms? How do I do this?

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Ok, the equation looks like this:
\[S _{n}=a _{1} \frac{ 1-r ^{n} }{ 1-r }\]

what's S, A, R, and N?

S= the sum
n=the term that you choose, so for this example it would be 6
\[a _{1}\]= the first term

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