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Solve the inequality 2x\(^2\) + 5x - 3 ≥ 0.

Further Mathematics
WAEC 2025

Solve the inequality 2x\(^2\) + 5x - 3 ≥ 0.

  • A. -\(\frac{1}{2}\) x ≤ x ≤3
  • B. -3 ≤ x ≤ \(\frac{1}{2}\)
  • C. x ≤ -3 or x ≥ \(\frac{1}{2}\)
  • D. x ≤ -\(\frac{1}{2}\) or x ≥3
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Correct Answer: Option C
Explanation

2x\(^2\) + 5x - 3 ≥ 0

2x\(^2\) + 6x - x - 3 \(\geq\) 0

2x(x + 3) - 1(x + 3)  \(\geq\) 0

(2x - 1)(x + 3)  \(\geq\) 0

2x  \(\geq\) 1 or x  \(\geq\) -3

x  \(\geq\) \(\frac{1}{2}\) 

\(\therefore\) x ≤ -3 or x ≥ \(\frac{1}{2}\) the only valid answer 

 

 


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