WAEC - Mathematics (2006 - No. 15)

Given that (2x - 1)(x + 5) = 2x2 - mx - 5, what is the value of m
11
5
-9
-10

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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