Use the Formula for the General Term of a Geometric $$\mathbf { a } _ { 1 }$$

Multiple Choice

Use the Formula for the General Term of a Geometric SequenceUse the formula for the general term (the nth term) of a geometric sequence to find the indicated term of the
sequence with the given first term, $$\mathbf { a } _ { 1 }$$ , and common ratio, r.
- $$5 , - 10,20 , - 40,80 , \ldots$$

A) $\mathrm { a } _ { \mathrm { n } } = 5 ( - 2 ) ^ { \mathrm { n } - 1 }$
B) $a _ { n } = 5 ( - 2 ) ^ { n }$
C) $a _ { n } = a _ { 1 } - 2 ^ { n }$
D) $a _ { n } = 5 ( - 2 n )$