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Mathematics 2021 JAMB Past Questions

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31

factorize m\(^3\) - m\(^2\) + 2m - 2

  • A. (m2 + 1)(m - 2)
  • B. (m - 1)(m + 1)(m + 2)
  • C. (m - 2)(m + 1)(m - 1)
  • D. (m2 + 2)(m - 1)
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32

The angles of a quadrilateral are 5x-30, 4x+60, 60-x and 3x+61.find the smallest of these angles​

  • A. 5x - 30
  • B. 4x + 60
  • C. 60 - x
  • D. 3x + 61
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33

What is the n-th term of the sequence 2, 6, 12, 20...?

  • A. 4n - 2
  • B. 2(3n - 1)
  • C. n2 + n
  • D. n2 + 3n + 2
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34

If the binary operation \(\ast\) is defined by m \(\ast\) n = mn + m + n for any real number m and n, find the identity of the elements under this operation

  • A. e = 1
  • B. e = -1
  • C. e = -2
  • D. e = 0
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35

Factorize completely 81a\(^4\) - 16b\(^4\)

  • A. (3a + 2b)(2a - 3b)(9a2 + 4b2)
  • B. (3a - 2b)(2a - 3b)(4a2 - 9b2)
  • C. (3a - 2b)(3a + 2b)(9a2 + 4b2)
  • D. (6a - 2b)(8a - 3b)(4a3 - 9b2)
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