# Theory of Equations/Functional Equations

**Welcome to the Lesson of Functional Equations**

*Part of the School of Olympiads*

In mathematics or its applications, a functional equation is an equation expressing a relation between the value of a function (or functions) at a point with its values at other points. Properties of functions can for instance be determined by considering the types of functional equations they satisfy. The term functional equation is usually reserved for equations that are not in a simple sense reducible to algebraic equations, often because two or more known functions are substituted as arguments into another function.

## Theorems

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edit3(x-2)=x+2 = 3x-6=x+2 = 3x-x-6=2 = 3x-x=2+6 = 2x=8 = 2x÷2=8÷2

## Resources

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