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Given (x + 3i) is a factor of f(x) = x4 + 8x2 - 9 , find all the zeros of the function by using

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Given (x + 3i) is a factor of f(x) = x4 + 8x2 - 9 , find all the zeros of the function by using synthetic division with complex numbers twice. Then, use whatever method you would like to find the zeros of the quadratic equation that is left. List the zeros below

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