Explain
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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Explain the determine
![4.5.2 Еxample B
Consider the equation
Yk+2 – 6yk+1 + 8yk = 2+ 3k² – 5 . 3k.
(4.146)
The characteristic equation is
p2 – 6r + 8 = (r – 2)(r – 4) = 0,
(4.147)
which leads to the following solution of the homogeneous equation:
(H)
c12* + c24*,
(4.148)
where
C1
and
C2 are arbitrary constants. The families of the terms in Rp are
→ [1],
k² → [1, k, k²],
3k → [3k).
(4.149)
The combined family is [1, k, k², 3k] and contains no members that occur in
the homogeneous solution. Therefore, the particular solution takes the form
(Р)
= A+ Bk + Ck² + D3k,
(4.150)
where A, B, C, and D are constants to be determined. Substitution of equation
(4.150) into (4.146) and simplifying the resulting expression gives
(ЗА — 4B — 2C) + (3B — 8C)k + ЗСК? — D3*
= 2+ 3k2 – 5 · 3k.
(4.151)
136
Difference Equations
Equating the coefficients of the linearly independent terms on both sides to
zero gives
ЗА
4B — 2С — 2,
ЗВ - 8С — 0,
ЗС %3 3, D % 5,
(4.152)
which has the solution
44/9,
= /4, C = 1, D= 5.
D = 5.
(4.153)
Consequently, the particular solution is
,(Р)
= 44/9 + 8/3k + k² +5. 3k,
(4.154)
and the general solution to equation (4.146) is
Yk = c12* + c24k + 44/9 + 8/3k + k² + 5· 3k.
(4.155)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fcf8ae0d8-6236-48e9-895b-2c58b4c18150%2F2530cec2-13b2-4576-9ea7-3d56708d6aa1%2F2zdgbli_processed.jpeg&w=3840&q=75)
Transcribed Image Text:4.5.2 Еxample B
Consider the equation
Yk+2 – 6yk+1 + 8yk = 2+ 3k² – 5 . 3k.
(4.146)
The characteristic equation is
p2 – 6r + 8 = (r – 2)(r – 4) = 0,
(4.147)
which leads to the following solution of the homogeneous equation:
(H)
c12* + c24*,
(4.148)
where
C1
and
C2 are arbitrary constants. The families of the terms in Rp are
→ [1],
k² → [1, k, k²],
3k → [3k).
(4.149)
The combined family is [1, k, k², 3k] and contains no members that occur in
the homogeneous solution. Therefore, the particular solution takes the form
(Р)
= A+ Bk + Ck² + D3k,
(4.150)
where A, B, C, and D are constants to be determined. Substitution of equation
(4.150) into (4.146) and simplifying the resulting expression gives
(ЗА — 4B — 2C) + (3B — 8C)k + ЗСК? — D3*
= 2+ 3k2 – 5 · 3k.
(4.151)
136
Difference Equations
Equating the coefficients of the linearly independent terms on both sides to
zero gives
ЗА
4B — 2С — 2,
ЗВ - 8С — 0,
ЗС %3 3, D % 5,
(4.152)
which has the solution
44/9,
= /4, C = 1, D= 5.
D = 5.
(4.153)
Consequently, the particular solution is
,(Р)
= 44/9 + 8/3k + k² +5. 3k,
(4.154)
and the general solution to equation (4.146) is
Yk = c12* + c24k + 44/9 + 8/3k + k² + 5· 3k.
(4.155)
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