%3D are expressio at %3D = 0, ...

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
Question
Solve the following ordinary differential equations using the power series method: y"-y=0
The power series method is a method of solving differential equations
SOLUTION OF DIFFERENTIAL EQUATIONS
USING THE POWER SERIES METHOD
which yields solutions in the form of power series. It is a very effective
standard procedure in connection with linear differential equation whose
coefficients are variable.
The basic idea of the power series method for solving differential equa-
tion is very simple and natural. Given differential equation, first represent
given functions in the equation by power series in powers of x. Then, assume
a solution in the form of a power series, say
y = Co + C,x + C,x2 + C3x +
and insert this series and the series obtained by termwise differentiation,
y' C, + 2C2X + 3C,x? +
y" = 2C, + 3(2)C,x + 4(3)C,x2 + ...
%3D
%3D
into the equation. Collecting like powers of x, write the resulting equation in
the form
Ko + K,x + K2x² +
= 0
...
... are expressions containing the unknown
where the constants Ko, K, K2
coefficients Co, C, etc. So that
Ko = 0, K, = 0, K2 = 0, ..
%3D
%3D
From these equations, determine the coefficients Co, C, C,,
Then substitute these coefficients into the assumed power series solution and
simplify.
successively.
PROBLEM:
Solve the differential equation y'-y 0 using the power series method.
%3D
Salution:
Transcribed Image Text:The power series method is a method of solving differential equations SOLUTION OF DIFFERENTIAL EQUATIONS USING THE POWER SERIES METHOD which yields solutions in the form of power series. It is a very effective standard procedure in connection with linear differential equation whose coefficients are variable. The basic idea of the power series method for solving differential equa- tion is very simple and natural. Given differential equation, first represent given functions in the equation by power series in powers of x. Then, assume a solution in the form of a power series, say y = Co + C,x + C,x2 + C3x + and insert this series and the series obtained by termwise differentiation, y' C, + 2C2X + 3C,x? + y" = 2C, + 3(2)C,x + 4(3)C,x2 + ... %3D %3D into the equation. Collecting like powers of x, write the resulting equation in the form Ko + K,x + K2x² + = 0 ... ... are expressions containing the unknown where the constants Ko, K, K2 coefficients Co, C, etc. So that Ko = 0, K, = 0, K2 = 0, .. %3D %3D From these equations, determine the coefficients Co, C, C,, Then substitute these coefficients into the assumed power series solution and simplify. successively. PROBLEM: Solve the differential equation y'-y 0 using the power series method. %3D Salution:
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