Question
Determine order and degree (if defined) of differential equations:

Solution
The given differential equation is
(y''')2 + (y'')3 + (y')4 + y5 = 0
The highest order derivative present in the given differential equation is y''' and the index of its highest power is 2.
∴ the given differential equation is of order 3 and degree 2.
(y''')2 + (y'')3 + (y')4 + y5 = 0
The highest order derivative present in the given differential equation is y''' and the index of its highest power is 2.
∴ the given differential equation is of order 3 and degree 2.