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4. Consider z4 - 4z3 + 8z2 - 40z + 100 = 0 for z E C. Two of the roots are a + bi

4. Consider z4 - 4z3 + 8z2 - 40z + 100 = 0 for z E C. Two of the roots are a + bi and b - ai where a, be Z. Find all possible values of a. /10

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