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Math Help - use the given zero ?

  1. #1
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    use the given zero ?

    Use the given zero to find the remaining zeros in the function.

    f(x)= x^4-32x^2-144 ; zero: -2i


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  2. #2
    Senior Member
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    Hi.

    Quote Originally Posted by relichunter09 View Post
    Use the given zero to find the remaining zeros in the function.

    f(x)= x^4-32x^2-144 ; zero: -2i
    If -2i is a zero, so is +2i.

    Use long polynomial division to calculate

    x^4-32x^2-144 : (x+2i)(x-2i)

    But you should calculate (x+2i)(x-2i) first. After that you are able to find the other zeros, -6 and +6


    Rapha
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