Post-UTME Mathematics 2016 Objective — Question 16
Question 16 of 60 from the Post-UTME Screening (Post-UTME) Mathematics 2016 Objective paper, with the correct answer and a full explanation.
Advertisement
Number Systems 6. The product of complex numbers (4,3) and (5,-6) is ?
- A. (18,3)
- B. (18,-3)
- C. (38,9)
- D. (38,-9)Correct
Explanation
(4+3i)(5-6i) = 20-24i+15i-18i² = 20-9i+18 = 38-9i, i.e. (38,-9).
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.