Question on: WAEC Mathematics - 2006
Given that (2x - 1)(x + 5) = 2x2 - mx - 5, what is the value of m
A
11
B
5
C
-9
D
-10
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Correct Option: C
(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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