WAEC Mathematics 2012 Objective — Question 5
Question 5 of 50 from the West African Examinations Council (WAEC) Mathematics 2012 Objective paper, with the correct answer and a full explanation.
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The nth term of a sequence is Tn = 5 + (n−1)². Evaluate T4 − T6.
- A. 30
- B. 16
- C. -16Correct
- D. -30
Explanation
T4 = 5+(4−1)² = 5+9 = 14. T6 = 5+(6−1)² = 5+25 = 30. T4−T6 = 14−30 = −16.
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