SOLUTION: (x4-1) has how many real zero
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Question 478057: (x4-1) has how many real zero
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
x^4 - 1 = 0 or x^4 = 1 has four zeros called "roots of unity." On the complex plane, they are 1, i, -1, and -i. Two of these (1, -1) are real.
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