# 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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