
Concept explainers
To calculate: The first five terms and limit and explain the limits exist or not.

Answer to Problem 45E
The values of terms are 43,2,167,229, and 2811 and limit is 3.
Explanation of Solution
Given information: an=6n−22n+1...(1)
To find the required five terms, put n=1,2,3,4, and 5 in equation (1), we get
Calculation:
Atn=1
a1=6×1−22×1+1=6−22+1=43
At n=2
a2=6×2−22×2+1=12−24+1=105=2
At n=3
a3=6×3−22×3+1=18−26+1=167
At n=4
a4=6×4−22×4+1=24−28+1=229
At n=5
a1=6×5−22×5+1=30−210+1=2811
Hence, first five terms are 43,2,167,229, and 2811
Now, calculate the limit of equation (1), we get
Let, ∴limx→∞an=limx→∞6n−22n+1
Formula used: limx→a[f(x)g(x)]=limx→af(x)limx→ag(x),[∵limx→ag(x)≠0]
=limx→∞6n−22n+1
Divide by highest denominator power
=limn→∞ (6−2n2+1n)
=limn→∞ (6−2n)limn→∞ (2+1n)
Put, the value of limit
=(6−2∞2+1∞)=62=3
⇒limx→∞− (6n−22n+1)+limx→∞+ (6n−22n+1)=3
Therefore, LHL is equal to RHL.
Hence, the limit is exist.
Chapter 11 Solutions
Precalculus with Limits: A Graphing Approach
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