Solve Ut - · 8xux + 7u = 0, x<∞, t> 0 u(x, 0) = 9 sin(x) First change to characteristic coordinates (§, s) where s = = t and દુઃ = help (formulas) picked so that when s = t = 0 then = x, and that the equation becomes an ODE in s : Us + = 0 help (formulas) with initial condition us 8=0= help (formulas) Solving this ODE, write u in terms of (§, s) : u = help (formulas) Finally write u in terms of (x, t) : u = help (formulas) Book: Section 1.9 of Notes on Diffy Qs

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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Question
Solve
Ut
-
· 8xux + 7u = 0,
x<∞, t> 0
u(x, 0) = 9 sin(x)
First change to characteristic coordinates (§, s) where s =
= t and
દુઃ
=
help (formulas)
picked so that when s =
t
=
0 then = x, and that the equation becomes an ODE in s :
Us +
= 0 help (formulas)
with initial condition us
8=0=
help (formulas)
Solving this ODE, write u in terms of (§, s) :
u =
help (formulas)
Finally write u in terms of (x, t) :
u =
help (formulas)
Book: Section 1.9 of Notes on Diffy Qs
Transcribed Image Text:Solve Ut - · 8xux + 7u = 0, x<∞, t> 0 u(x, 0) = 9 sin(x) First change to characteristic coordinates (§, s) where s = = t and દુઃ = help (formulas) picked so that when s = t = 0 then = x, and that the equation becomes an ODE in s : Us + = 0 help (formulas) with initial condition us 8=0= help (formulas) Solving this ODE, write u in terms of (§, s) : u = help (formulas) Finally write u in terms of (x, t) : u = help (formulas) Book: Section 1.9 of Notes on Diffy Qs
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