Mathematics 2021 Past Questions | JAMB

Study the following Mathematics past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

31. factorize m3– m2+ 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)

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

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

34. If the binary operation ∗is defined by m ∗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

35. Factorize completely 81a4– 16b4

  • 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)

36. Find x if log9x = 1.5

  • A. 27
  • B. 15
  • C. 3.5
  • D. 32

37.  List all integers satisfying the inequality in -2 < 2x-6 < 4 

  • A. 2,3,4 and 5
  • B. 2,3
  • C. 2,5
  • D. 3,4

38.  X is due east point of y on a coast. Z is another point on the coast but 6.0km due south of Y. If the distance ZX is 12km, calculate the bearing of Z from X

  • A. 240°
  • B. 150°
  • C. 60°
  • D. 270°

39. A group of market women sell at least one of yam, plantain and maize. 12 of them sell maize, 10 sell yam and 14 sell plantain. 5 sell plantain and maize, 4 sell yam and maize, 2 sell yam and plantain only while 3 sell all the three items. How many women are in the group?

  • A. 25
  • B. 19
  • C. 18
  • D. 17

40. If (x + 2) and (x – 1) are factors of the expression Lx+2kx2, find the values of L and k.

  • A. l = -12, k = -6
  • B. l = -2 , k = 1
  • C. l = -2 , k = -1
  • D. l = 0, k = 1
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