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

question 209

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) \(a _ { n } = 5 ( - 2 n )\)

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