Given that (2x - 1)(x + 5) = 2x 2 - mx - 5, what
MATHEMATICS
WAEC 2006
Given that (2x - 1)(x + 5) = 2x2 - mx - 5, what is the value of m
- A. 11
- B. 5
- C. -9
- D. -10
Correct Answer: C. -9
Explanation
(2x - 1)(x + 5) = 2x2 - mx - 5
2x2 + 10x - x - 5
= 2x2 + 9x - 5 = 2x2 - mx - 5
comparing the co-efficient of x
-m = 9
m = -9
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