Åk 6–9
  • Start
  • 1. Welcome to Formulas and Functions
  • 2. Concepts
  • 3. From Pictures to Formulas
  • 4. Calculating with Formulas and Functions
  • 5. Second Degree Functions
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    English/عربي
    1.1 Introduction
    The word function means relation. A relation is a connection between two things.  Imagine that you have one machine. For the machine to work, you need to give it information, and that there is a relation between the information that you give it and what the machine does.

    A car is a machine, and the car will work differently depending on which information it gets.  There is a relationship between you giving it gas, hitting the break, etc and what the car does.  What the car does is the function of the information it gets.

    Foto: Christian Almstedt,
    aLotOfPhotos



    The Function Machine
    Imagine that the machine to the right is programmed to do some function.

    There is a relation between the numbers that we feed it and the numbers we get out.  The machine handles every entered number with the same rule.  This relation is called a function.

    Foto: Fredrik Enander