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Math Help - Zeros of an Equation

  1. #1
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    Arrow Zeros of an Equation

    How do you find the zeros of an equation? For example, y= x^3 - 16x^2 +x + 4?

    And how can you find them on a graphing calculator?


    Thanks.
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by oryxncrake View Post
    How do you find the zeros of an equation? For example, y= x^3 - 16x^2 +x + 4?

    And how can you find them on a graphing calculator?


    Thanks.
    Hi oryxncrake,

    Which graphing calculator are you using? For a TI-84+ see here.
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  3. #3
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    Quote Originally Posted by oryxncrake View Post
    How do you find the zeros of an equation? For example, y= x^3 - 16x^2 +x + 4?

    And how can you find them on a graphing calculator?


    Thanks.
    The Cauchy bound tells you that all the roots have absolute value less than or equal to 17, so you need only plot the function over the interval x=-17 to 17

    (and the rational roots theorem tell you none of the roots are rational)

    CB
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