AnswersCR - Algebra 2 26-27 - S1Operations with Complex Numbers

Operations with Complex Numbers Answers

10 verified answers1 views
1
Free Preview

Melissa and Tomas are playing a game with complex numbers. If Melissa has a score of 5 – 4i and Tomas has a score of 3 + 2i, what is their total score?

A
8 – 6i
B
8 + 6i
C
8 – 2i
D
8 + 2i
2
Free Preview

What is the value of (–7 + 3i) – (2 – 6i)?

A
–9 + 9i
B
–9 – 3i
C
–5 – 3i
D
–5 + 9i
3

Which property of multiplication is shown below? If x = a + bi and y = c + di, x × y = y × x.

A
commutative property
B
identity property
C
distributive property
D
associative property
4

Which property of addition is shown in the equation below?a + bi + 0 + 0i = a + bi

A
commutative property
B
inverse property
C
identity property
D
associative property
5

Aiko is finding the sum (4 + 5i) + (–3 + 7i). She rewrites the sum as (–3 + 7)i + (4 + 5)i. Which statement explains the error Aiko made by using a mathematical property incorrectly?

A
Aiko incorrectly used the commutative property by changing the order of the two complex numbers.
B
Aiko incorrectly used the associative property by changing the order of the two complex numbers.
C
Aiko incorrectly used the identity property by combining the real number and the coefficient of the imaginary part.
D
Aiko incorrectly used the distributive property by combining the real number and the coefficient of the imaginary part.
6

What is the additive inverse of the complex number –8 + 3i?

A
–8 – 3i
B
–8 + 3i
C
8 – 3i
D
8 + 3i
7

Donte simplified the expression below.What mistake did Donte make?

Question illustration
A
He did not apply the distributive property correctly for 4(1 + 3i).
B
He did not distribute the subtraction sign correctly for 8 – 5i.
C
He added the real number and coefficient of i in 4(1 + 3i).
D
He added the two complex numbers instead of subtracted.
8

Which equation illustrates the identity property of multiplication?

A
(a + bi) × c = (ac + bci)
B
(a + bi) × 0 = 0
C
(a + bi) × (c + di) = (c + di) × (a + bi)
D
(a + bi) × 1 = (a + bi)
9

Which equation demonstrates the additive identity property?

A
(7 + 4 i) + (7 minus 4 i) = 14
Option A
B
(7 + 4 i) + 0 = 7 + 4 i
Option B
C
(7 + 4 i) (1) = 7 + 4 i
Option C
D
(7 + 4 i) + (negative 7 minus 4 i) = 0
Option D
10

Which property of addition is shown below?a + bi + c + di = a + c + bi + di

A
identity property
B
associative property
C
commutative property
D
inverse property

Did you find these answers helpful?

More from this Course

Quiz
10 verified answers

Transformations of Quadratic Functions

Quiz
10 verified answers

Operations with Complex Numbers

Quiz
10 verified answers

Completing The Square