defence exam CISF Head Constable Ministerial (HCM) & ASI Steno Mock Test Series Quantitative Aptitude Algebra Identities

If 4x2 + \(\rm\frac{1}{x^2}\) = 12 for a positive number x, then the value of 8x3 + \(\rm\frac{1}{x^3}\) is:

1
64
2
16
3
40
4
4
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