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Factor the expression completely over the complex numbers.

 

 Jan 26, 2018
 #1
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Solve for x:

x^4 - 81 = 0

 

Add 81 to both sides:

x^4 = 81

 

Taking 4^th roots gives 3 times the 4^th roots of unity:

x = -3    or    x = -3 i    or    x = 3 i    or    x = 3

 Jan 26, 2018

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