- #1

- 24

- 1

3-7i/2+3i

For the life of me I cannot sqeeze this into my brain!

Thank you in advance.

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- Thread starter Echo 6 Sierra
- Start date

- #1

- 24

- 1

3-7i/2+3i

For the life of me I cannot sqeeze this into my brain!

Thank you in advance.

- #2

BoulderHead

…Don’t forget to use the FOIL method.

- #3

enigma

Staff Emeritus

Science Advisor

Gold Member

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- 14

Echo, when adding and subtracting complex terms (imaginary and real), you just keep the like terms together.

In other words, you add the imaginary parts, and then you add the real parts.

For example:

3+8+5i+7i/4=

(3+8)+(5+7/4)i=

11+(27/4)i

- #4

BoulderHead

We had conversed through PM and Echo 6 Sierra didn't make me aware of this. We treated the problem as;

(3-7i)/(2+3i)

Perhaps Echo 6 Sierra can clarify, as I assumed the parenthesis had been mistakenly omitted. If not, my mistake then.

(3-7i)/(2+3i)

Perhaps Echo 6 Sierra can clarify, as I assumed the parenthesis had been mistakenly omitted. If not, my mistake then.

Last edited by a moderator:

- #5

enigma

Staff Emeritus

Science Advisor

Gold Member

- 1,752

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Ah hah.

Gotcha. Parenthesis. Yes, that would be division then, wouldn't it?

Gotcha. Parenthesis. Yes, that would be division then, wouldn't it?

- #6

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- #7

dav2008

Gold Member

- 609

- 1

But yea, conjugate of the denomitator is how u do it...

OR

You can change it to polar ( i think thats what its called) And then u have

r

and u just divide the radii and subtract the angles...Not sure tho..i know for multiplication u multiply the radii and add the angles so i would assume u do the opposite for division

- #8

- 24

- 1

Problem solved. Thank you to everyone for your input.

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