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

A. x - 4

B. x + 4

C. x - 6

D. x + 6

B. x+4

x^2 - 5x - 36

take two numbers which when multiplied will get 36 and when added gets - 5. The two numbers are + 4 and - 9.

x^2 + 4x - 9x - 36

x (x+4) - 9 (x+4)

factors are:

(x+4), (x-9)