Estimation of cube root - class-VIII

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Question 1 of 16

If $x = \sqrt [3]{a + \sqrt {a^{2} - b^{3}}} + \sqrt [3]{a - \sqrt {a^{2} - b^{3}}}$ then $x^{3} + 3bx = $ ____________.

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$2a$

$2b$

$3a$

$4a$

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