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WAEC Mathematics 2015 Paper
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© africaexams.com
Question : 9
Total: 45
Find the equation whose roots are
3
4
and -4
4x
2
- 13x + 12 = 0
4x
2
- 13x - 12 = 0
4x
2
+ 13x - 12 = 0
4x
2
+ 13x + 12 = 0
Validate
Solution:
Let x =
3
4
or x = -4
i.e. 4x = 3 or x = -4
(4x - 3)(x + 4) = 0
therefore, 4x
2
+ 13x - 12 = 0
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