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Math Help - All real zeros of a function

  1. #1
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    All real zeros of a function

    the question is to find all real zeros of the function algebraically

    x^3-4x^2-36x+144
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  2. #2
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    Hint: x^3 -4x^2 -36x +144 = x^2(x-4) -36(x-4)
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