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1. a3-21a-20

  • A. a+1
  • B. a+1
  • C. a+1
  • D. a+1

Answer: Option A

Explanation:

a3 - 21a - 20 = a2(a + 1) - a(a + 1) - 20(a + 1) = (a + 1)(a2 - a - 20)

 

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