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13 December, 00:14

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

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Answers (1)
  1. 13 December, 00:19
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    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)
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