Find the common ratio 3, 9, 27, 81

2 answers:

amm18123 years ago

7 0

Answer:

Multiplying by 3

Step-by-step explanation

3 to 9 = 3 x 3

9 to 27 = 9 x 3

27 to 81 = 27 x 3

Therefore, the common ratio is multiplying by 3

Dmitrij [34]3 years ago

6 0

The answer is 3

81/27 = 3
27/9 = 3
9/3 = 3

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navik [9.2K]

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$a_n=-3 \cdot a_{n-1}$

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You gave the explicit form.

Step-by-step explanation:

You gave the explicit form.

The recursive form is giving you a term in terms of previous terms of the sequence.

So the recursive form of a geometric sequence is $a_n=r \cdot a_{n-1}$ and they also give a term of the sequence; like first term is such and such number. All this says is to get a term in the sequence you just multiply previous term by the common ratio.