(A) Find the radius of convergence of the power series 23 26 + 3.2 (6-5)-(3-2) (9-8)-(6-5)-(3-2) y=1- + Remark: The absolute value of the ratio of terms has a very simple and obvious expression and the ratio test indicator can be easily computed from that. (B) Show that the function so defined satisfies the differential equation y" + xy = 0.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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(A) Find the radius of convergence of the power series
x3
x6
x⁹
+
3.2 (6.5) (3-2) (9.8) (6-5)-(3-2)
y = 1
+
Remark: The absolute value of the ratio of terms has a very simple and
obvious expression and the ratio test indicator can be easily computed
from that.
(B) Show that the function so defined satisfies the differential equation
y" + xy = 0.
Transcribed Image Text:(A) Find the radius of convergence of the power series x3 x6 x⁹ + 3.2 (6.5) (3-2) (9.8) (6-5)-(3-2) y = 1 + Remark: The absolute value of the ratio of terms has a very simple and obvious expression and the ratio test indicator can be easily computed from that. (B) Show that the function so defined satisfies the differential equation y" + xy = 0.
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