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The graph is that of y = 2x2 - 5x - 3. For what value...

Mathematics
WAEC 2012

The graph is that of y = 2x2 - 5x - 3. For what value of x will y be negative? For what value of x will y be negative?
  • A. -\(\frac{1}{2} \leq x\) < 3
  • B. -\(\frac{1}{2} < x \leq 3\)
  • C. -\(\frac{1}{2} < x < 3\)
  • D. -\(\frac{1}{2} \leq x \leq 3\)
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Correct Answer: Option C
Explanation
2x2 - 5x - 3 = 0

2x2 - 6x + x - 3 = 0

2x(x - 3) + 1(x - 3) = 0

(2x + 1)(x - 3) = 0

2x + 1 = 0

2x = -1

x = -\(\frac{1}{2}\)

x - 3 = 0

-\(\frac{1}{2}\) < x < 3

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