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Indices

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An index is the number which is at the top right hand corner of a figure which denotes a power. The power of a number is how many times the number is multiplied by itself. For example:

2² = 2 × 2 = 4
4³ = 4 × 4 × 4 = 64
3⁴ = 3 × 3 × 3 × 3 = 81

When using indices you should remember the following things:

• Multiplying adds the powers:
  n^x × n^y = n^x+y
  
  
• Division subtracts the powers:
  n^x ÷ n^y = n^x-y
  
  
• A negative index means the number is reciprocated:
  n^-x = 1 / n^x
  
  
• For fractional indices, the numerator is the power of the base number and the denominator is the root of this number:
  n^x/y = ^yn^x
  
  
• n¹ = n
  
  
• n⁰ = 1

About the Author

by: Admin
Total views: 760
Word Count: 201
Date: Thu, 14 Sep 2006 Time: 12:00 AM
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Revision notes by Richard Tang

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