AnswersKY-Algebra II CRUnit Test

Complex Numbers Answers

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If f(x) = x3 – 2x2, which expression is equivalent to f(i)?

A
–2 + i
B
–2 – i
C
2 + i
D
2 – i
2
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Which of the following is an example of a complex number that is not in the set of real numbers?

A
-7
B
2 + StartRoot 3 EndRoot
Option B
C
4 + 9i
D
Pi
Option D
3

What is the sum of and ?

Question illustration
A
4 StartRoot 2 EndRoot
Option A
B
4 StartRoot 2 EndRoot i
Option B
C
5 StartRoot 2 EndRoot
Option C
D
5 StartRoot 2 EndRoot i
Option D
4

What is the square root of –16?

A
–8i
B
–4i
C
4i
D
8i
5

Which complex number has an absolute value of 5?

A
–3 + 4i
B
2 + 3i
C
7 – 2i
D
9 + 4i
6

If f(x) = 1 – x, which value is equivalent to |f(i)|?

A
0
B
1
C
StartRoot 2 EndRoot
Option C
D
StartRoot negative 1 EndRoot
Option D
7

If the complex number x = 3 + bi and |x|2 = 13, which is a possible value of b?

A
2
B
4
C
9
D
10
8

What is the distance from the origin to point A graphed on the complex plane below?

Question illustration
A
StartRoot 5 EndRoot
Option A
B
StartRoot 13 EndRoot
Option B
C
9
D
13
9

In which quadrant is the number –14 – 5i located on the complex plane?

A
I
B
II
C
III
D
IV
10

Which expression is equivalent to ?

Question illustration
A
Negative 4 StartRoot 5 EndRoot
Option A
B
Negative 4 StartRoot 5 EndRoot i
Option B
C
4 StartRoot 5 EndRoot i
Option C
D
4 StartRoot 5 EndRoot
Option D

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