Originally Posted by

**pnklv** Thanks 4 check, life saver since the triple integral on my exam near dragged my points down below 12/20

Srry if this seems a stupid question, but what is ODE ( i assume a program/applet to calc DE's) & where can I find it ? ( might come in handy later

)

ODE means Ordinary differential equation.

What I ment is you cant take derivatives of your solution and plug them into the ode and check your solution. This is exactly like solving

$\displaystyle 2x+4=0 \implies x=2$

and plugging $\displaystyle x=2$ into it to check your solution.

IF you look at the attached immage above this code

Code:

diff(y,x$2)-2*diff(y,x)-3*y

means

$\displaystyle y''-2y'-3y$

and it did give the correct solution.