# Advanced Problem Solving Module 17 ### Advanced Problem Solving Module 17

In this module, get to grips with differential equations.

### Modelling with Differential Equations

##### Age 16 to 18
This article covers what differential equations are, and offers some insight into how to formulate one describing a real life situation.

### First Order Differential Equations

##### Age 16 to 18
In STEP and other advanced mathematics examinations, two main methods are used to solve first order differential equations: separation of variables and the method of integrating factors. This article reviews how the two work.

### Second Order Differential Equations

##### Age 16 to 18
Many modelling situations force us to deal with second order differential equations. In STEP and other advanced mathematics examinations a particular set of second order differential equations arise, and this article covers how to solve them.

### It's Only a Minus Sign

##### Age 16 to 18Challenge Level
Solve these differential equations to see how a minus sign can change the answer

### Example STEP Differential Equation Questions

##### Age 16 to 18
Here you can find several example questions from STEP past papers for you to practice your skills on.