2021 - JAMB Mathematics Past Questions and Answers - page 4
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)
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
Find 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 \(\ast\) 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
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)
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
Give that X is due east point of YÂ on a coast. ZÂ 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 \(Lx + 2kx^{2} + 24\), 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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