(x? + 11)y" + 5y-y = 0. (1) By analyzing the singular points of the differential equation, we know that a series solution of the form y = E o Cn x" for the differential equation will converge at least on the interval (2) Substituting y = n " into (z? + 11)y" + 5xy' - y = 0. you get that 00 n-2 n-1 (z2 + 11) n= 2 n(n-1) +5x = 0 n n=1 n n=0 Multiplying the coefficients in x through the sums n-2 11n(n-1) n(n-1) n(n-1) X 1 =D0 n= n= n 2 2 1 Reindex the sums 00 00 n n(n-1) 11(n+2)n 8n = 0 X 1 n= n%3= n n+2 n 2 1 Finally combine the sums
(x? + 11)y" + 5y-y = 0. (1) By analyzing the singular points of the differential equation, we know that a series solution of the form y = E o Cn x" for the differential equation will converge at least on the interval (2) Substituting y = n " into (z? + 11)y" + 5xy' - y = 0. you get that 00 n-2 n-1 (z2 + 11) n= 2 n(n-1) +5x = 0 n n=1 n n=0 Multiplying the coefficients in x through the sums n-2 11n(n-1) n(n-1) n(n-1) X 1 =D0 n= n= n 2 2 1 Reindex the sums 00 00 n n(n-1) 11(n+2)n 8n = 0 X 1 n= n%3= n n+2 n 2 1 Finally combine the sums
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:In this problem you will solve the differential equation
(x? + 11)y" + 5xy – y = 0.
(1) By analyzing the singular points of the differential equation, we know that a series solution of the form y = Eo Cn x" for the differential equation will converge at least on the interval
(2) Substituting y = Eo Cn x" into (x + 11)y" + 5xy' – y = 0. you get that
00
Σ
n-2
n-1
(x2 + 11)
n(n-1)
+5x
1
X
n= 2
n
n= 1
n=0
Multiplying the coefficients in x through the sums
00
n-2
n(n-1)
11n(n-1)
n(n-1)
1
C
X.
X
n=
n=
n=
n
n
2
1
Reindex the sums
n(n-1)
X.
11(n+2)n
8n
1
= 0
n=
n=
n=
n=
n
n+2
n
2
Finally combine the sums

Transcribed Image Text:Finally combine the sums
x" = 0
n=
The subscripts on the c's should be increasing and numbers or in terms of n.
(3) In this step we will use the equation above to solve for some of the terms in the series and find the recurrence relation.
(a) From the constant term in the series above, we know that
%3D
(b) From the coefficient of r in the series above, we know that
ngulan Sp
%3D
(c) From the series above, we find that the recurrence relation is
C
for
(4) The general solution to (x? + 11)y" + 5xy'-y = 0 converges at least on
and is
y = Co
76 +..
+ Cj
+..
(5) Solve the initial value problem
(x2 + 11)y" + 5xy - y = 0
y(0) = -1
y(0)
= -4
y =
x2+
T' +...
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