Solve for the roots of the following equation.
5x2 – 4x – 1 = 0
x6 – 2x3 – 8 = 0
u = 4 and u = -2, with u = x3
2x2 – 5x – 15 = 0
-2x3 + 6x3/2 – 4 = 0
u = 1 and u = 2, with u = x3/2
x = 1 and
x5 + 3x3 – 4x = 0
, with u = x2
x = 0, x = 1, x = -1, x = 2i, and x = -2i
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