Find the roots of: $x^{4} - 26 x^{2} + 25 = 0$

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Solution

$x^{4} - 26 x^{2} + 25 = 0$
$x^{4} - x^{2} - 25 x^{2} + 25 = 0$
$x = \pm 1, \pm 5$

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