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Functions

Solve: x3+3x...

Question

Solve: $x^{3} + 3 x = 0$

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Solution

$x^{3} + 3 x = 0$
$\Rightarrow x (x^{2} + 3) = 0$
$\Rightarrow x = 0, x^{2} + 3 = 0$
$\Rightarrow x = 0, x = \pm \sqrt{- 3} = \pm i \sqrt{3}$

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