Find $x$
$x^{2} - 8 x + 15 = 0$

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Solution

$x^{2} - 8 x + 15 = 0 x^{2} - 5 x - 3 x + 15 = 0 x (x - 5) - 3 (x - 5) = 0 (x - 3) (x - 5) = 0 x = 3, 5$

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x^{2} - 8 x + 15 = 0

x^{2} + 8 x + 15 = 0

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