Complex Numbers
15 Questions
| Attempts: 164
Apply your knowledge about complex numbers. You may use your notes sheet as a resource. Each problem is worth 2 points. Write answers in STANDARD FORM where applicable.
Questions and Answers
- 1.
I2 = ___
- A.
1
- B.
-1
- C.
-(-1)
- D.
Sqrt(-1)
Correct Answer
B. -1 -
- 2.
(3 + 2i) + (9 - 7i)
- A.
-5i + 12
- B.
12 + 9i
- C.
12 - 5i
- D.
9i + 12
Correct Answer
C. 12 - 5i -
- 3.
(7 - 8i) - (12 + 7i)
Correct Answer
-5-15i
-5 - 15i - 4.
Solve for x.x2 + 49 = 0
- A.
7
- B.
-7
- C.
7, -7
- D.
7i, -7i
- E.
Sqrt(-7)
Correct Answer
D. 7i, -7i -
- 5.
(-6 - 5i)(1 + 3i)
Correct Answer
9 - 23i
9-23i - 6.
(9 + 4i)2
Correct Answer
65 + 72i
65+72i - 7.
5 / (5 - 10i)
- A.
(1/5) - (2i/5)
- B.
(25 - 50i)
- C.
3/5
- D.
(1 - 2i)
Correct Answer
A. (1/5) - (2i/5) -
- 8.
In the expression 3 + 8i, 8i is the ____________ part.
- A.
Real
- B.
Imaginary
- C.
Fake
Correct Answer
B. Imaginary -
- 9.
Which of the following is an example of a pure imaginary number?
- A.
-8
- B.
1 + 8i
- C.
I / 8
- D.
12,876,215 + sqrt(-1)
Correct Answer
C. I / 8 -
- 10.
|3 + 4i|
Correct Answer
5 - 11.
|16i|
Correct Answer
16 - 12.
(4 - 2i)(6 + 6i)
Correct Answer
36+12i
36 + 12i - 13.
Write the complex conjugate of ( 5 + 123i)
Correct Answer
5-123i
5 - 123i - 14.
Solve for x.3x2 + 1 = x2 - 1
- A.
1, -1
- B.
I
- C.
I, -i
- D.
-1
Correct Answer
C. I, -i -
- 15.
Sqrt(-169)
Correct Answer
13i
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Jan 10, 2013Quiz Edited by
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Mar 09, 2010Quiz Created by
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