Question 457779
Sub u for x^(1/3)
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u^2 - 3u - 4 = 0
(u-4)*(u+1) = 0
u = -1, 4
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x^(1/3) = -1
x = -1
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x^(1/3) = 4
x = 64
Not that hard, just a bit tricky.