Question

Medals Medals!
Compute the modulus and argument of each complex number..
1. -5i
2. sqrt10(cos(5pi/7)+isin(5pi/7)

Answer 1

modulus is 'r'
argument is 'theta

Answer 2

for 2nd,
compare your expression with
\(\large r(\cos \theta +i\sin \theta)\)

Answer 3

for 1st.

x+iy = 0-5i

x=0, y=-5
use the formulas to calculate r and theta

Answer 4

okay, so its going to look like (0, -5) right? i worked of an example i saw and my modulus became 55.9 and was stated as being "undefined"

Answer 5

sorry, it was 5 and not 55.9!!

Answer 6

i dont know where that came from

Answer 7

theta was stated as undefined ?

Answer 8

yeah, but im not so sure

Answer 9

where does 0,-5 point lie ?

Answer 10

on the y ais

Answer 11

not in any quadrant :P

Answer 12

yeah, my bad!

Answer 13

negative y axis