SOLUTION: (x4-1) has how many real zero

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: (x4-1) has how many real zero      Log On


   

Question 478057: (x4-1) has how many real zero
Answer by richard1234(7193) About Me  (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.