Practice question · Select all that apply
Let z = 3 + 2i and w = 1 + 5i. Select every TRUE statement about z + w.
Hints
- Add real parts and imaginary parts separately.
- 3 + 1 = 4 and 2 + 5 = 7.
Show the answer
- B. z + w = 4 + 7i
- D. The real part is 4
- E. The imaginary part is 7
Why
(3+2i)+(1+5i) = (3+1)+(2+5)i = 4 + 7i, so its real part is 4 and imaginary part 7. The two distractors leave one of the parts unadded.
Practise Complex Numbers
The app has 6 more questions on this lesson, and keeps your place in the course. Computer Science I is free to start.
More questions on Complex Numbers
- Least squares minimises squared error, which makes it sensitive to outliers. Why is that sensitivity accepted…
- Sort each number by whether it is real, purely imaginary, or a general complex number.
- Least-squares fitting minimises the sum of SQUARED residuals rather than the sum of absolute ones. What does…