# How to solve differential equations

Differential equations make use of mathematical operations with derivatives. **Solving differential equations** is a very important, but also hard concept in calculus. There exist more methods of solving this kind of exercises.

Firstly, we will have a look on how first order differential equation can be solved. Below, you will find a series of methods of solving this kind of differential equations. The first one is the separation method of variables. Practically, as the name says itself, you have to separate the variables, obtaining an equality of two functions with different variables. Then you integrate the expression and you obtain an equality of two integrals. Then you will solve the integrals and find the solution.

For the homogeneous differential equations, we use the substitution method and we reduce the equation to the variable separable. Having an exercise in which you have to **solve the differential equation**, you firstly have to figure out what kind of differential equation is the equation, so you know what method it's better to use.

Another method to **solve differential equation** is the exact form method. You know your equation is in an exact form if it has the following form: M(x,y) dx + N(x,y) dy = 0, where M and N are the functions of x and y in such a way that:

A differential equation is called linear as long as the dependent variable and its derivatives occur in the first degree and are not multiplied together.

f_{1 }to f_{n} are the functions of x.

In order to figure out how to solve differential equation, you firstly have to determine the order of the differential equation. For example, for the second order differential equation there is a more special method of finding the solution: divide the second order differential equation in 2 parts: Q(x)=0 and Q(x) is a function of x. For both members calculate the auxiliary equation and find the complementary function. Next, if Q(x) is a part of the equation, find the particular integral of the equation. In the end, sum up the complementary function with the particular integral.

## Solving differential equations video lesson

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