# 2nd order diff equations

wombat4000

## Homework Statement

http://img178.imageshack.us/img178/6444/scan0001abq4.th.jpg [Broken]

## The Attempt at a Solution

this isn't a straight forward calculate the soltion to a 2nd ode so I am pretty stumped.

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Homework Helper
Firstly, suppose y1 is a solution to y''+ay'+by=g(x). What then is a solution of y''+ay'+by=kg(x), where k is an arbitrary non-zero constant?

Secondly, note that a general solution to a non-homogenous linear ODE is its homogenous solution plus one particular solution to its nonhomogenous ODE.

wombat4000
solution to y''+ay'+by=kg(x) is ky1?

so the solution to y''+ay'+by=3g(x) is the complimentyery function + particular integral = 3y1 + y2?

Homework Helper
That should be correct.

wombat4000
thanks!
http://img237.imageshack.us/img237/3676/167uqnbsi6.gif [Broken]

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