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A sequence is defined by the recursive function [tex]f(n+1) = \frac{1}{3} f(n)[/tex]. If [tex]f(3) = 9[/tex], what is [tex]f(1)[/tex]?

A. 1
B. 3
C. 27
D. 81

Answer :

Sure! Let's solve this step-by-step using the given recursive function.

We are given the following:
[tex]\[ f(n+1) = \frac{1}{3} f(n) \][/tex]
and
[tex]\[ f(3) = 9 \][/tex]

We want to find [tex]\( f(1) \)[/tex].

First, let's work our way backward from [tex]\( f(3) \)[/tex] to [tex]\( f(1) \)[/tex]:

1. Find [tex]\( f(2) \)[/tex] from [tex]\( f(3) \)[/tex]:
[tex]\[ f(3) = \frac{1}{3} f(2) \][/tex]
We know [tex]\( f(3) = 9 \)[/tex], so:
[tex]\[ 9 = \frac{1}{3} f(2) \][/tex]
To find [tex]\( f(2) \)[/tex], multiply both sides by 3:
[tex]\[ f(2) = 9 \times 3 \][/tex]
[tex]\[ f(2) = 27 \][/tex]

2. Find [tex]\( f(1) \)[/tex] from [tex]\( f(2) \)[/tex]:
[tex]\[ f(2) = \frac{1}{3} f(1) \][/tex]
We now know [tex]\( f(2) = 27 \)[/tex], so:
[tex]\[ 27 = \frac{1}{3} f(1) \][/tex]
To find [tex]\( f(1) \)[/tex], multiply both sides by 3:
[tex]\[ f(1) = 27 \times 3 \][/tex]
[tex]\[ f(1) = 81 \][/tex]

So, the value of [tex]\( f(1) \)[/tex] is [tex]\( 81 \)[/tex].

Therefore, the correct answer is:
[tex]\[ 81 \][/tex]

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