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What is the recursive formula for this geometric sequence?
4, -12, 36, -108, ...

What is the recursive formula for this geometric sequence? 4, -12, 36, -108, ...-example-1
User Leifericf
by
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2 Answers

3 votes

Answer: C


\left \{ {{a_(1)=4 } \atop {a_(n)=a_(n-1)*(-3) }} \right.

Explanation:

The starting amount (a1) = 4

The rate is -3 because 4 * -3 = 12 and -12 and -12 * -3 = 36 etc.

User Timur Shtatland
by
8.2k points
2 votes

Answer: C.

Explanation:

The first number is a positive 4, which is your a1. Then the geometric sequence goes to a negative implying that it is multiplied by a negative. So the a1 = 4 and it is being multiplied by a negative 3.

User Marwan Tushyeh
by
8.2k points

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