WAEC Mathematics 2019 Objective — Question 4
Question 4 of 145 from the West African Examinations Council (WAEC) Mathematics 2019 Objective paper, with the correct answer and a full explanation.
Advertisement
4. Simplify, correct to three significant figures, (27.63)² − (12.37)².
- A. 614
- B. 612
- C. 611
- D. 610Correct
Explanation
By difference of two squares: (27.63)²−(12.37)² = (27.63+12.37)(27.63−12.37) = (40)(15.26) = 610.4 ≈ 610.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.