How do I do this cubic equation?

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  1. lizz-ie's Avatar
    1 16-07-2012  15:36
    • Adored and Respected Member
    • Posts: 497
    How do I do this cubic equation?
    I worked out the answer in my head, but I need to know how to do it properly with a method; can anyone help?

    x^3-x=0
  2. Brit_Miller's Avatar
    2 16-07-2012  15:42
    • Benevolent Member
    • Location: Bristol
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    Re: How do I do this cubic equation?
    Factorise.
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  3. AhzhaK's Avatar
    3 16-07-2012  15:45
    • Exalted Member
    • Location: Glasgow
    • Posts: 275
    Re: How do I do this cubic equation?
    x^3-x=0

    take out common factor of x: x(x^2-1)=0

    therefore x=0 and x^2-1=0

    rearrange: x^2=1
    square root: x=squareroot1
    =1,-1

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