Quantitative Aptitude Algebra Identities

If 2x2 + 5x - 1 = 0, then what is the value of x3 - \(\frac{1}{{8{x^3}}}\)?

1
-\(\frac{155}{8}\)
2
-\(\frac{125}{8}\)
3
\(\frac{145}{4}\)
4
\(\frac{125}{8}\)

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