Arithmétique de base (document en anglais)
Analyse sectorielle : Arithmétique de base (document en anglais). Recherche parmi 300 000+ dissertationsPar itslilly • 19 Décembre 2014 • Analyse sectorielle • 206 Mots (1 Pages) • 788 Vues
2 Basic Arithmetic
2.3 Indices
Indices or powers starts of as repeated multiplication. In this chapter we will look at how indices are written and state the rules which are used for manipulating them.
2.3.1 Index Notation
If is a real number and is a natural number then
.
is called the index, power or exponent on and is called the base.
Example:
The number is written, for short as and we read it as “6 raised to the power 3” or “6 cubed”.
When dealing with numbers your calculator is able to evaluate expressions involving powers. Using the power button on your calculator you should obtain .
Example:
Identify the base and the index:
In the expression , 7 is the base and 12 is the index.
In the expression , 3 is the base and 5 is the index.
In the expression , 2 is the base and is the index.
2.3.2 Rules for Indices
add indices when multiplying numbers or
variables with the same base
subtract indices when dividing numbers or variables with the same base
multiply indices together when raising a number or variables to a power
Examples:
Use the laws of indices:
...