x^8-17x^4+16=0
risuktato: +- 1 , +_i , +_2,+_2i
u = x^4
u^2 - 17 u + 16 = 0
u = 1 V u = 16
x^4 = 1
x = -1 V x = i V x = 1 V x = -i
x^4 = 16
x = -2 V x = -2i V x = 2 V x = 2i
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