# Exponentials on TI-83

1. Jan 9, 2012

### 14prc

hi guys,
I have a little bit strange question

Somebody maybe know how to add to exponential on calculator to get directly answer, i mean like that:

8.7exp(-i145)+5.4exp(-i285) = 5.81exp(i176)

but i dont know how get this without polar form

2. Jan 9, 2012

### Staff: Mentor

this is not a calculation you do on your calculator unless you have one that can do complex number addition.

The 8.7exp(-i45) ... are complex numbers you need to convert each number to trig form from the euler form you have and then to x + iy form before adding them.

3. Jan 9, 2012

### 14prc

I tried this aslo but is not working, just adding/substracting real and imaginary part. I thought to change smth in MODE but but didt help

4. Jan 9, 2012

### Staff: Mentor

why do you have to do it on the calculator? is that what the teacher said?

or does he/she expect you to use the calculator to convert it to the trig and then x+iy format and then use the calculator again to add the real and imaginary parts and then convert back to the euler format?

5. Jan 9, 2012

### 14prc

its for course electric power, need to count current faster

6. Jan 9, 2012

7. Jan 9, 2012

### 14prc

Thanks you so much :) i will test :)