WAEC Mathematics 2016 Objective — Question 10
Question 10 of 50 from the West African Examinations Council (WAEC) Mathematics 2016 Objective paper, with the correct answer and a full explanation.
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10. The roots of a quadratic equation are 4/3 and -3/7. Find the equation. A. 21x²-19x-12=0 B. 21x²+37x-12=0 C. 21x²-x+12=0 D. 21x²+7x-4=0
- A. 21x²-19x-12=0Correct
- B. 21x²+37x-12=0
- C. 21x²-x+12=0
- D. 21x²+7x-4=0
Explanation
(x-4/3)(x+3/7)=0 → x²+3x/7-4x/3-12/21=0; multiplying through by 21 gives 21x²-19x-12=0.
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