Question

Which expression is a cube root of -2?

A. ^3sqrt2(cos(90) + isin(90))
B. ^3sqrt2(cos(60) + isin(60))
C. ^3sqrt2(cos(260) + isin(260))
D. ^3sqrt2(cos(120) + isin(120))

Answer 1

@Melodysim can you help?

Answer 2

uh... I dont think I can

Answer 3

@SolomonZelman

Answer 4

Hey could you help?

Answer 5

@jim_thompson5910 can you help??

Answer 6

@thomaster can you please help??

Answer 7

were you able to get anywhere julesstrawberry?

Answer 8

yeah i was able to get it, i do have another question though

Answer 9

go ahead

Answer 10

i need to find which expressions are the same, let me attach a screen shot

Answer 11

@jim_thompson5910 this is the full question

Answer 12

what you picked is incorrect

Answer 13

This page has a good example

http://www.ditutor.com/complex_numbers/trigonometric_form.html

Answer 14

is it d? i'm pretty sure it is but not 100%

Answer 15

what's the radius for choice d

Answer 16

3sqrt2?

Answer 17

sqrt18 simplifies to 3sqrt2 and if you found the modulus then you would get that

Answer 18

right?

Answer 19

which quadrant is -3-3i in?

Answer 20

3?

Answer 21

?????

Answer 22

@jim_thompson5910 am i right?

Answer 23

hello?????

Answer 24

so what is the angle of this complex number?

Answer 25

i do not know

Answer 26

well look at choice D and tell me what the angle is

Answer 27

45?

Answer 28

??????????????????

Answer 29

notice they have -pi/4

where is that located? which quadrant?

Answer 30

quadrant 3

Answer 31

no

Answer 32

2? i really do not know

Answer 33

alright

Answer 34

so where is this angle?

Answer 35

quadrant 4

Answer 36

but -3-3i is in quadrant 3

Answer 37

so it can't be that

Answer 38

what about c?