If $x = 2^{1/3} - 2^{-1/3}$,find the value of $2x^3 + 6x$.

  • A
    $1$
  • B
    $2$
  • C
    $3$
  • D
    $4$

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If $x = a^{1/2} + a^{-1/2}$ and $y = a^{1/2} - a^{-1/2}$,then find the value of $(x^4 - x^2 y^2 - 1) + (y^4 - x^2 y^2 + 1)$.

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Solve the given two equations and select the correct answer from the given options.
$I.$ $x^{2}-25=0$
$II.$ $y^{2}-9y+20=0$

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Solve the given two equations and select the correct answer from the given options.
$I.$ $(289)^{\frac{1}{2}} x - \sqrt{324} = 203$
$II.$ $(484)^{\frac{1}{2}} y - \sqrt{225} = 183$

The set of values of $a$ such that $x^2 - 2ax + a^2 - 6a \leqslant 0$ for all $x \in [1, 2]$ is:

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