If 23 x + 101 x = 130 x , find the value of x
MATHEMATICS
WAEC 2016
If 23x + 101x = 130x, find the value of x
- A. 7
- B. 6
- C. 5
- D. 4
Correct Answer: D. 4
Explanation
23x + 101x = 130x
2 x X1 + 3 x Xo + 1 x X2 + 0 x X1 + 1 x Xo
= 1 x Xo = 1 x X2 + 3 x X1 + 0 x Xo
= X2 + 3x + 0
2x + 3 = x2 + 0 + 1 + x2 + 3x
2x - 3x + x2 - x2 = -3 - 1
- x = -4
x = 4
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