# Mathematics 2021 Past Questions | JAMB

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

**31. **factorize m^{3}– m^{2}+ 2m – 2

**A.**(m^{2}+ 1)(m – 2)**B.**(m – 1)(m + 1)(m + 2)**C.**(m – 2)(m + 1)(m – 1)**D.**(m^{2}+ 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(3^{n – 1})**C.**n^{2}+ n**D.**n^{2}+ 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 81a^{4}– 16b^{4}

**A.**(3a + 2b)(2a – 3b)(9a^{2}+ 4b^{2})**B.**(3a – 2b)(2a – 3b)(4a^{2}– 9b^{2})**C.**(3a – 2b)(3a + 2b)(9a^{2}+ 4b^{2})**D.**(6a – 2b)(8a – 3b)(4a^{3}– 9b^{2})

**36. **Find x if log_{9}x = 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+2kx^{2}, 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