A Trick For Differential Equations | 2nd Order Integrating Factor

We explore a technique similar to the integrating factor method, for 2nd order differential equations. This leads to a neat derivation of the solutions for differential equations whose auxiliary equations have repeated roots. 00:00 Motivating example 03:28 Integrating factor method 06:20 Generalising to 2nd order DEs 09:03 Back to our starting example 11:53 Exercises to try 12:22 Corollary - repeated roots