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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)
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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