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Quiz

Year 2: Complex numbers

10 questions with solutions for year 2: the imaginary unit, real and imaginary parts, adding, subtracting, multiplying and dividing, conjugates, modulus, the complex plane.

Type the number or choose the right answer. When you finish, click Check answers and see the solutions.

1. i² = ?

2. i³ = ?

3. What is the imaginary part of 3 − 5i?

4. (2 + 3i) + (4 − i) = ?

5. (5 + 2i) − (1 + 6i) = ?

6. (1 + i)(1 − i) = ?

7. (2 + i)² = ?

8. What is the conjugate of 4 − 7i?

9. |3 + 4i| = ?

10. (1 + i) / (1 − i) = ?