If x – 9 is a factor of x2 – 5x – 36, what is the other factor?

Since x − 9 is a factor, divide x² − 5x − 36 by x − 9. The quotient is x + 4, because (x − 9)(x + 4) = x² − 5x − 36. Therefore, the other factor is x + 4, choice B.

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