Unit Test — Unit test Answers
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21
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What is the value of ?
A
–3 + 6iB
3 + 6iC
5 + 5iD
5 – 5i22
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Which pair of complex numbers has a real-number product?
A
(1 + 2i)(8i)B
(1 + 2i)(2 – 5i)C
(1 + 2i)(1 – 2i)D
(1 + 2i)(4i)23
Given w = and , what is w – z expressed in polar form?
A
StartRoot 2 EndRoot (cosine (StartFRaction pi Over 4 EndFraction) + I sine (StartFraction pi Over 4 EndFraction) )
B
StartRoot 2 EndRoot (cosine (StartFraction 3 pi Over 4 EndFraction) + I sine (StartFraction 3 pi Over 4 EndFraction) )
C
StartRoot 2 EndRoot (cosine (StartFraction 5 pi Over 4 EndFraction) + I sine (StartFraction 5 pi Over 4 EndFraction) )
D
StartRoot 2 EndRoot (cosine (StartFraction 7 pi Over 4 EndFraction) + I sine (StartFraction 7 pi Over 4 EndFraction) )
24
Let z = and .What is the product of zw?
A
40 (cosine (StartFraction pi Over 16 EndFraction) + I sine (StartFraction pi Over 16 EndFraction) )
B
76 (cosine (StartFraction pi Over 16 EndFraction) + I sine (StartFraction pi Over 16 EndFraction) )
C
40 (cosine (StartFraction 3 pi Over 16 EndFraction) + I sine (StartFraction 3 pi Over 16 EndFraction) )
D
76 (cosine (StartFraction 3 pi Over 16 EndFraction) + I sine (StartFraction 3 pi Over 16 EndFraction) )
25
In a video game, two objects move around the screen according to the equations r = 4cos(θ) and r = –1 + 2cos(θ). Which coordinates represent a possible collision point of the objects?
A
(Negative 2, StartFraction 2 pi Over 3 EndFraction)
B
(Negative 2, StartFraction 5 pi Over 6 EndFraction)
C
(2, StartFraction 2 pi Over 3 EndFraction)
D
(2, StartFraction 5 pi Over 6 EndFraction)
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