
Concept explainers
Write an equation for the nth term of the geometric series with the information a2=4; r=3

Answer to Problem 5CYU
an= 4 · 3n−2
Explanation of Solution
Given:
The information: a2=4; r=3
Concept Used:
General equation for the nth term of any geometric series is an= a1 · rn−1
Where a1 the first term and r is the common ratio
Calculation:
Use the Exponent rules:
Product rule = am · an = am+n
Negative exponet rule : a− m = 1am
Step 1: Find the value of a1 from the information a2=4; r=3
an= a1 · rn−1a2=16; r=3a2= a1 · r2−1=a1 · r4= a1 · 3=3a143=3a13a1=43
a1=43; r=3an= a1 · rn−1=43 ·(3)n−1= 4 · 3−1 ·(3)n−1=4 · 3n−1−1=4 · 3n−2an= 4 · 3n−2
Thus, nth term of the series is an= 4 · 3n−2
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