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Mathematics 23 Online
OpenStudy (kitkat16):

Please Help! What are the two complex numbers? I'm not sure how to write this correctly. Is it 3 and 3i-3 or 3i and 3i-3 ?? Or am I totally off?

OpenStudy (solomonzelman):

It seems as though the information is missing.

OpenStudy (solomonzelman):

I am not exactly sure, what you are trying to do.

OpenStudy (kitkat16):

OpenStudy (kitkat16):

sorry wasn't allowing me to post a pic

OpenStudy (anonymous):

Do you know the coordinates of those two endpoints? :D

OpenStudy (kitkat16):

3,-3

OpenStudy (kitkat16):

0,3 and 3,-3

OpenStudy (anonymous):

Good. For each coordinate (a , b) there is a complex number a + bi Just turn (0,3) and (3,-3) into a+bi form and you're good to go lol

OpenStudy (kitkat16):

:( not sure what that is

OpenStudy (anonymous):

Like, if it's (7 , 8) its a+bi form is simply 7 + 8i. Simple :D

OpenStudy (kitkat16):

-3i and 3+3i

OpenStudy (kitkat16):

wouldn't it ne a -3?

OpenStudy (kitkat16):

*be

OpenStudy (kitkat16):

these were my choices -3 and 3-3i -3i and 3+3i 3 and 3i-3 3i and 3-3i 3i and 3i-3

OpenStudy (kitkat16):

I choose 3 and 3i-3

OpenStudy (kitkat16):

not sure if it was correct

OpenStudy (anonymous):

How did you get those answers?

OpenStudy (kitkat16):

they were on my assignment

OpenStudy (anonymous):

Forget those for now and tell me how you actually arrived at those answers :)

OpenStudy (kitkat16):

oh from y axis is 3i and x is 3,-3

OpenStudy (kitkat16):

am I reading it wrong?

OpenStudy (anonymous):

Whoa, hold it, hold it.... Start with the coordinates first.

OpenStudy (anonymous):

You got your coordinates correctly, so put them up again, just to be sure...

OpenStudy (kitkat16):

(0,3), (3,-3)

OpenStudy (phi):

now add an "i" to the second coordinate (the y value)

OpenStudy (kitkat16):

3i-3

OpenStudy (phi):

you put the "i" in the wrong place (you put it on the x value)

OpenStudy (kitkat16):

3 and 3i-3

OpenStudy (kitkat16):

3 and 3-3i

OpenStudy (phi):

(0,3) becomes ? put the "i" on the 2nd number in the pair.

OpenStudy (kitkat16):

3i and 3-3i

OpenStudy (phi):

yes, much better.

OpenStudy (anonymous):

Aww yeah :D

OpenStudy (phi):

the main idea is the "y" is the imaginary part and "x" is the real part. to show the imaginary part, tack on an "i"

OpenStudy (kitkat16):

so I always start with the imaginary

OpenStudy (phi):

I think (x,y) then remember the y is imaginary, so add i

OpenStudy (kitkat16):

ok thank you! I need brains like you guys. :)

OpenStudy (phi):

you'll get brains if you practice.

OpenStudy (kitkat16):

haha I never remember this stuff. my brain shuts down.

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