One of the factors of $x^{2} - 15 x + 56$ is

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$x + 8$

$x - 6$

$x + 7$

$x - 8$

answer is B.

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Detailed Solution

$\begin{array}{l} x^{2} - 15 x + 56 \\ = x^{2} - 7 x - 8 x + 56 \\ = x (x - 7) - 8 (x - 7) \\ = (x - 7) (x - 8) \\ The factors are (x - 7) and (x - 8) \end{array}$

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