# Reduction to first order

• May 18th 2010, 08:53 AM
EinStone
Reduction to first order
How do I reduce this ODE into a system of 2 variables of first oder?

$y'' + (2y^2+3y'^2-1)y' + y = 0$
• May 18th 2010, 12:21 PM
zzzoak
$u=y'$
$v=y$