The **order** of a differential equation is:
- The highest power of the dependent variable
- The highest-order derivative present in the equation
- The number of arbitrary constants in the solution
- Always equal to its degree
Show answer and solution
Correct answer: B. The highest-order derivative present in the equation
Order = highest order of derivative appearing.
e.g. $d^2y/dx^2 + 3(dy/dx) + y = 0$ has order 2 (because of $d^2y/dx^2$).
The order is always a positive integer.