
a.
To find: A power series whose interval of convergence is (p,q) .
a.

Answer to Problem 36E
The series having interval of convergence (p,q) is ∞∑n=0[2x−(p+q)(q−p)]n .
Explanation of Solution
Given Information: p and q are real numbers with p<q .
Calculation:
Let the series ∑f(x) has interval of convergence (a,b) .
Then the series ∑f(xc) has interval of convergence (c.a,c.b) and the series ∑f(x−c) has interval of convergence (c+a,c+b) .
For the interval (p,q) , the mid-point is p+q2 and radius of convergence is q−p2 .
Now, the interval of convergence of the series ∞∑n=0xn is (−1,1) .
So, the interval of convergence of the series ∞∑n=0[x(q−p)/2]n is (p−q2,q−p2) and the interval of convergence of ∞∑n=0[x−p+q2(q−p)/2]n is (p−q2+p+q2,q−p2+p+q2)=(p,q) .
Simplifying, ∞∑n=0[x−p+q2(q−p)/2]n=∞∑n=0[2x−(p+q)(q−p)]n .
Thus, the series having interval of convergence (p,q) is ∞∑n=0[2x−(p+q)(q−p)]n .
b.
To find: A power series whose interval of convergence is (p,q] .
b.

Answer to Problem 36E
The series having interval of convergence (p,q] is ∞∑n=1[2x−(p+q)(q−p)]n.(−1)nn .
Explanation of Solution
Given Information: p and q are real numbers with p<q .
Calculation:
Let the series ∑f(x) has interval of convergence (a,b] .
Then the series ∑f(xc) has interval of convergence (c.a,c.b] and the series ∑f(x−c) has interval of convergence (c+a,c+b] .
For the interval (p,q] , the mid-point is p+q2 and radius of convergence is q−p2 .
Now, the interval of convergence of the series ∞∑n=1xn.(−1)nn is (−1,1] .
So, the interval of convergence of the series ∞∑n=1[x(q−p)/2]n.(−1)nn is (p−q2,q−p2] and the interval of convergence of ∞∑n=1[x−p+q2(q−p)/2]n.(−1)nn is (p−q2+p+q2,q−p2+p+q2]=(p,q] .
Simplifying, ∞∑n=1[x−p+q2(q−p)/2]n.(−1)nn=∞∑n=1[2x−(p+q)(q−p)]n.(−1)nn .
Thus, the series having interval of convergence (p,q] is ∞∑n=1[2x−(p+q)(q−p)]n.(−1)nn .
c.
To find: A power series whose interval of convergence is [p,q) .
c.

Answer to Problem 36E
The series having interval of convergence [p,q) is ∞∑n=1[2x−(p+q)(q−p)]n.1n .
Explanation of Solution
Given Information: p and q are real numbers with p<q .
Calculation:
Let the series ∑f(x) has interval of convergence [a,b) .
Then the series ∑f(xc) has interval of convergence [c.a,c.b) and the series ∑f(x−c) has interval of convergence [c+a,c+b) .
For the interval [p,q) , the mid-point is p+q2 and radius of convergence is q−p2 .
Now, the interval of convergence of the series ∞∑n=1xnn is [−1,1) .
So, the interval of convergence of the series ∞∑n=1[x(q−p)/2]n.1n is [p−q2,q−p2) and the interval of convergence of ∞∑n=1[x−p+q2(q−p)/2]n.1n is [p−q2+p+q2,q−p2+p+q2)=[p,q) .
Simplifying, ∞∑n=1[x−p+q2(q−p)/2]n.1n=∞∑n=1[2x−(p+q)(q−p)]n.1n .
Thus, the series having interval of convergence [p,q) is ∞∑n=1[2x−(p+q)(q−p)]n.1n .
d.
To find: A power series whose interval of convergence is [p,q] .
d.

Answer to Problem 36E
The series having interval of convergence [p,q] is ∞∑n=1[2x−(p+q)(q−p)]n.1n2 .
Explanation of Solution
Given Information: p and q are real numbers with p<q .
Calculation:
Let the series ∑f(x) has interval of convergence [a,b] .
Then the series ∑f(xc) has interval of convergence [c.a,c.b] and the series ∑f(x−c) has interval of convergence [c+a,c+b] .
For the interval [p,q] , the mid-point is p+q2 and radius of convergence is q−p2 .
Now, the interval of convergence of the series ∞∑n=1xnn2 is [−1,1] .
So, the interval of convergence of the series ∞∑n=1[x(q−p)/2]n.1n2 is [p−q2,q−p2] and the interval of convergence of ∞∑n=1[x−p+q2(q−p)/2]n.1n2 is [p−q2+p+q2,q−p2+p+q2]=[p,q] .
Simplifying, ∞∑n=1[x−p+q2(q−p)/2]n.1n2=∞∑n=1[2x−(p+q)(q−p)]n.1n2 .
Thus, the series having interval of convergence [p,q] is ∞∑n=1[2x−(p+q)(q−p)]n.1n2 .
Chapter 8 Solutions
Single Variable Calculus: Concepts and Contexts, Enhanced Edition
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