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

  • A 11
  • B 5
  • C -9
  • D -10
waec 2006mathematics

The correct answer is C. -9

(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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