2011
Mathematics
JAMB
Evaluate ∣∣∣∣42−1231−1−13∣∣∣∣
A.
25
B.
45
C.
15
D.
55
Correct Answer: 25
Explanation
4[(3 x 3) - (-1 x 1)] -2 [(2x 3) - (-1 x -1)] -1 [(2 x 1) - (-1 x 3)] = 4[9 + 1] -2 [6 - 1] -1 [2 + 3] = 4(10) - 2(5) - 1(5) = 40 - 10 - 5 = 25
4[(3 x 3) - (-1 x 1)] -2 [(2x 3) - (-1 x -1)] -1 [(2 x 1) - (-1 x 3)] = 4[9 + 1] -2 [6 - 1] -1 [2 + 3] = 4(10) - 2(5) - 1(5) = 40 - 10 - 5 = 25THIS WEEK's
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