
Concept explainers
(a)
To find: the 9th term of the geometric sequence using the table feature of a graphing utility.
(a)

Answer to Problem 34E
9th term of the geometric sequence is 0.8009.
Explanation of Solution
Given information:
Given geometric sequence
a1=8,r=−34
Calculation:
To have the nth term of the geometric sequence, firstly click on 2nd button and then click on STAT button. After this, a new screen will appear. The screenshot is given as below:
Now, move to the OPS option and then move to the 5th option and press the ENTER button. After this, give the input in this function. The pattern of the giving the input. Then finally press the ENTER button to have the desired value. The screenshot is given as below:
Therefore, according to the above screenshot, the 9th term is 0.8009.
(b)
To find: the 9th term of the geometric sequence algebraically.
(b)

Answer to Problem 34E
9th term of the geometric sequence is 0.8009.
Explanation of Solution
Concept used:
The n th term of geometric sequence has the form a1=a1rn−1 where r is the common ratio of the consecutive terms of the sequence.
Every geometric sequence can be written in the following form.
a1=a1,a2=a1r,a3=a1r2,a4=a1r3,...,an=a1rn−1,..
Calculation:
The 9th term of this geometric sequence can be calculated by using formula:
an+1=arn
So,
a8+1=8×(−34)8a9=8×656165536a9=52248865536≈0.8009
Hence, 9th term of this geometric sequence is 0.8009.
Chapter 8 Solutions
Precalculus with Limits: A Graphing Approach
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