Complex Number Skill Check p. I

which is the imaginary unit?

• i = √-1

• i² = -1

• i³ = - i

• i⁴ = 1

what is the first step of the problem below?

(-5i) - (5 - 8i) - (-6 + i)

• divide

• subtract

• add

• none of these

what belongs in the blank ( -6 + 4i ) ( 1 - ___ )

if the answer is 18 + 40i

• 8i

• 7

• 6i

• 5

the area of a square with a side of (6 - 6i)

will result in what kind of final answer?

• real + imaginary number

• imaginary number only

• real number

  only

• imaginary + real number

what is the value of x for

x² = -27

• 9√3i

• 3√3

• 3

• none of these

fact or cap?

13 + 2i - 4 - 8i = 9 - 6i

• true

• false

what is the product of

(2i)(-5i)

• - 10

• 9

• - 8

• none of these

find the perimeter of ta rectangle with

the width of (4 - 2i) and a length of (8+2i).

for the answer what is the coefficient of the real number?

• -16

• 36

• -8

• 32

( a + bi ) is the correct format of reading/writing complex numbers?

• yeah! wait let me think... yes!

• wait, no i don't remember learning this?

identify the error and explain how to fix it.

step 1: ( 6 + 8i ) - ( -2 + 4i )

step 2 : 6 + 8i - 2 + 4i

step 3: 8 + 12 = ?

answer: 16

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