- Thread starter
- #1

#### karush

##### Well-known member

- Jan 31, 2012

- 2,886

$ y = t^r$

for

$t > 0 $}$

$t^2y''+4ty'+2y = 0$

$\color{red}{r=-1,-2}$

$t^2y''-4ty'+4y=0$

$\color{red}{r=1,4}$

ok the book answers are in red, and obviously this is from a factored quadradic but I couldn't an example of the steps.

probably just a couple!