Question

Write the complex number in the form a + bi.

3(cos 270° + i sin 270°)

Answer 1

What is the cosine of 270?

Answer 2

= 0

Answer 3

What is the sin of 270?

Answer 4

-1

Answer 5

Substitute those values into 3(cos 270° + i sin 270°) and simplify

Answer 6

i got 3?

Answer 7

3i

Answer 8

*

Answer 9

0+3i in a + bi form

Answer 10

these are my answer choices..
-3i

3i

3

-3

Answer 11

so would it just be the 3i?

Answer 12

3(0+-1i)=0-3i=-3i

Answer 13

oh yeah duh lol thank you!! can you just tell me if my answer is correct on this other problem?

Answer 14

What other problem?

Answer 15

Find the product of z1 and z2 where z1 = 7(cos 40° + i sin 40°), and z2 = 6(cos 145° + i sin 145°).
and for my answer i got .. 42(cos 185° + i sin 185°)

Answer 16

?

Answer 17

Yes. That is correct.

Answer 18

ok thankyou!!

Answer 19

yw