WAEC Further Mathematics 2022 Objective — Question 31
Question 31 of 40 from the West African Examinations Council (WAEC) Further Mathematics 2022 Objective paper, with the correct answer and a full explanation.
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Find the range of values of x for which 2x²+7x−15≥0.
- A. x≥−5 or x≤3/2
- B. x≤−5 or x≥3/2Correct
- C. −5≤x≤3/2
- D. −3/2≤x≤5
Explanation
Factoring: 2x²+7x−15 = (2x−3)(x+5). This is ≥0 when x≤−5 or x≥3/2.
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