2015
Mathematics
JAMB
Find x if 132x = 70 eight .
A.
5
B.
3
C.
6
D.
1
Correct Answer: 6
Explanation
132x = 708 1 × x2 + 3 × x1 + 2 × x0 7 × 81 + 0 ×80 x2 +3x + 2 −56 = 0 x2 + 3x −54 = 0 x(x + 9) −6(x + 9) = 0 (x + 9)(x − 6) = 0 Either (x + 9) = 0 or (x − 6) = 0 x = − 9 or +6 The positive values for x = 6 The base number for 132x = 1326
132x = 708 1 × x2 + 3 × x1 + 2 × x0 7 × 81 + 0 ×80 x2 +3x + 2 −56 = 0 x2 + 3x −54 = 0 x(x + 9) −6(x + 9) = 0 (x + 9)(x − 6) = 0 Either (x + 9) = 0 or (x − 6) = 0 x = − 9 or +6 The positive values for x = 6 The base number for 132x = 1326THIS WEEK's
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