Concept explainers
To Write: Write the explicit and recursive formula for the given geometric sequence.

Answer to Problem 4LC
The recursive formula is
The explicit formula is
Explanation of Solution
Given information : The given sequence is 5, 20, 80, 320,…
Here the geometric sequence is 5, 20, 80, 320,…
Here the first term is
The recursive formula is
Now, substituting the value of r
The explicit formula is
Substituting the value of a and r
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