Solve the equation — task. Assessments, Math TN.

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Solve

$x^4 - 13x^2 + 42 = 0$ , then

$x =$ _________

$\sqrt{6}, \sqrt{7}$
$\sqrt{6}, \pm \sqrt{7}$
$\pm \sqrt{6}, \sqrt{7}$
$\pm \sqrt{6}, \pm \sqrt{7}$

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