Two mark example problem V — task. Mathematics State Board, Class 10.

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Solve

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

Answer:

$x =$

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

(Note: Select multiple answers if they are correct.)

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