(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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