Question

Express the complex number in trigonometric form.

-3i

Answer 1

How far did you get?

Answer 2

i just dont know how to find the degree

Answer 3

Draw a blank xy axis

Answer 4

3(cos x° + i sin x°)

Answer 5

i dont know how to find x

Answer 6

ok

Answer 7

the complex number -3i is really 0 + (-3i) = 0 + (-3)i

this is in the form a+bi where a = 0, b = -3

complex numbers a+bi can be plotted on an xy axis in the form of the point (a,b)

Answer 8

So we plot (0, -3)

Answer 9

would that be 270?

Answer 10

Then you need to find the angle that starts at the positive x axis and it stops when the ray points in the direction of the point (0,-3)



yes it's 270 degrees