determine the coefficient of x4 in (a+bx+cx2)7 The textbook solution is a5c2(7!/(2!5!)) + a4b2c(7!/(4!2!1!)) + a3b4(7!/(3!4!)) but I don't know how to get there. Thanks!
determine the coefficient of x4 in (a+bx+cx2)7 The textbook solution is a5c2(7!/(2!5!)) + a4b2c(7!/(4!2!1!)) + a3b4(7!/(3!4!)) but I don't know how to get there. Thanks!
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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determine the coefficient of x4 in (a+bx+cx2)7
The textbook solution is a5c2(7!/(2!5!)) + a4b2c(7!/(4!2!1!)) + a3b4(7!/(3!4!)) but I don't know how to get there.
Thanks!
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