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

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Solution

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

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

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

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

x^{2} - 8 x + 5 = 0

Solve the following quadratic equation: $x^{2} + 8 x + 15 = 0$

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