Factorise: $x^{2} - 39 x - 129 = 0$

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Solution

$x^{2} - 39 x - 129 = 0$
$x = \frac{39 \pm \sqrt{39^{2} - 4 x - 129}}{2}$
$x = \frac{39 \pm \sqrt{1521 + 516}}{2}$
$x = \frac{39 \pm \sqrt{2037}}{2}$

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