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1. x2+x-20=?

  • A. (x-5)(x+4)
  • B. (x-5)(x+4)
  • C. (x-5)(x+4)
  • D. (x-5)(x+4)

Answer: Option B

Explanation:

x2 + x - 20 = x2 + 5x - 4x - 20 = x(x + 5) - 4(x + 5) = (x + 5)(x - 4)

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