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If (x - 1)⁴ - 16 = 0, then the sum of the non-real (complex) roots x is:

1. 2
2. 0
3. 4
4. none of these

Correct answer: 2

Solution

The non-real roots are 1 + 2i and 1 - 2i, which are conjugates and sum to 2.

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