Concept explainers
a.
State the common difference.
a.

Answer to Problem 5PS
d .
Explanation of Solution
Calculation:
Consider the arithmetic sequence with first term a and common difference d .
a,a+d,a+2d,a+3d,...
The general term nth of the sequence is given by
an=a+(n−1)d
Add a constant C to each term of the sequence.
So, the resulting sequence will be
a+C,a+d+C,a+2d+C,a+3d+C,...
Then the general term of the sequencing will be
an=a+(n−1)d+C
Note that ,
an−an−1=(a+(n−1)d+C)−(a+(n−2)d+C)
=d
Difference between each two consecutive term is same,
Hence, the resulting sequence is also an arithmetic sequence and the coomon difference of arithmetic sequence is d .
b.
State the common difference.
b.

Answer to Problem 5PS
Cd .
Explanation of Solution
Calculation:
Consider the arithmetic sequence with first term a and common difference d .
a,a+d,a+2d,a+3d,...
The general term nth of the sequence is given by
an=a+(n−1)d
Multiply each term of the sequence by C .
So, the resulting sequence will be
aC,(a+d)C,(a+2d)C,(a+3d)C,...
Then the general term of the sequencing will be
an=(a+(n−1)d)C
Note that ,
an−an−1=(a+(n−1)d)C−(a+(n−2)d)C
=Cd
Difference between each two consecutive term is same,
Hence, the resulting sequence is also an arithmetic sequence and the coomon difference of arithmetic sequence is Cd .
c.
Find if each operation results in an arithmetic sequence.
c.

Answer to Problem 5PS
The sequence is not an arithmetic sequence.
Explanation of Solution
Calculation:
Consider the arithmetic sequence with first term a and common difference d .
a,a+d,a+2d,a+3d,...
The general term nth of the sequence is given by
an=a+(n−1)d
Square each term of the sequence.
So, the resulting sequence will be
a2,(a+d)2,(a+2d)2,(a+3d)2,...
Then the general term of the sequencing will be
an=(a+(n−1)d)2
Note that ,
an−an−1=(a+(n−1)d)2−(a+(n−2)d)2=(a2 +(n−1)2d2+2a(n−1)d−(a2 +(n−2)2d2+2a(n−2)d))=(−3+2n)d2+2ad
So, the difference depends upon the value n .
Difference between each two consecutive terms is not same.
Hence, the resulting sequence is not arithmetic sequence.
Chapter 9 Solutions
EBK PRECALCULUS W/LIMITS
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