WAEC Mathematics 2017 Objective — Question 7
Question 7 of 50 from the West African Examinations Council (WAEC) Mathematics 2017 Objective paper, with the correct answer and a full explanation.
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Given that a=log 7 and b=log 2, express log 35 in terms of a and b
- A. A. a+b+1
- B. B. ab-1
- C. C. a-b+1Correct
- D. D. b-a+1
Explanation
log 35 = log(7x5) = log7 + log5 = log7 + log10 - log2 = a + 1 - b = a-b+1 (since log10=1).
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