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WAEC Mathematics 2016 Paper
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© africaexams.com
Question : 1
Total: 49
If 23
x
+ 101
x
= 130
x
, find the value of x
7
6
5
4
Validate
Solution:
23
x
+ 101
x
= 130
x
2 x X
1
+ 3 x X
o
+ 1 x X
2
+ 0 x X
1
+ 1 x X
o
= 1 x X
o
= 1 x X
2
+ 3 x X
1
+ 0 x X
o
= X
2
+ 3x + 0
2x + 3 = x
2
+ 0 + 1 + x
2
+ 3x
2x - 3x + x
2
- x
2
= -3 - 1
- x = -4
x = 4
© africaexams.com
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