Post-UTME Mathematics 2016 Objective — Question 20
Question 20 of 60 from the Post-UTME Screening (Post-UTME) Mathematics 2016 Objective paper, with the correct answer and a full explanation.
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Number Systems 10. √-9 x √-9 = ?
- A. 9
- B. -9Correct
- C. 9i
- D. -9i
Explanation
√-9 = 3i; (3i)(3i) = 9i² = -9.
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