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Definition of a radical number

  1. Jan 6, 2008 #1
    I would love to know the definition of a radical number...JUST a radical number. I'm terrible at memorizing anything and have completly forgotton this term. I don't want any other inormation then what I am asking. All I want is a few sentences to explain a radical number. Equations are the easy part of math.
     
  2. jcsd
  3. Jan 6, 2008 #2

    HallsofIvy

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    A radical number (also called a 'surd') is any number that can be written as a root of a rational number or an algebraic combination of such.

    Examples:
    [itex]\sqrt{2}[/itex] is a "radical" number.

    [itex]^3\sqrt{7- \sqrt{3}}[/itex] is a "radical" number.
     
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