ogkwelch
ogkwelch ogkwelch
  • 18-10-2017
  • Mathematics
contestada

Which are factors of x2 – 4x – 5? Check all that apply. (x – 5) (x – 4) (x – 2) (x + 1) (x + 5)

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choixongdong
choixongdong choixongdong
  • 18-10-2017
x^2 – 4x – 5 = (x - 5)(x + 1)
cause
(x - 5)(x + 1) = x^2 -5x +x - 5= x^2 -4x - 5

so (x - 5) and (x + 1) are factors

answer
(x - 5) and (x + 1) 
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AnimeBrainly
AnimeBrainly AnimeBrainly
  • 18-10-2017
x² - 4x - 5
x          -5
x           1

(x-5)(x+1) is your answer

none of the others work, because they wont give you the desired number in the middle, -4x

hope this helps
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