Absolute Value And Argument
(This topic is in Mathematics S&T Paper 1, Chapter 1)
Absolute value and argument of a given complex number can be calculated by using our scientific calculator. I will show you how to obtain the absolute value and argument for a complex number 2 + 2i using a Casio fx-570ES calculator.
First of all, we need to learn how to input that complex number 2 + 2i . The steps are as follows :
1. Press 2.
2. Press +.
3. Press 2.
4. Press SHIFT.
5. Press ENG.
Hmm, the complex number 2 + 2i should be seen now.
To find the absolute value of 2 + 2i :
1. Press MODE.
2. Select 2. (Now your calculator is in the complex mode)
3. Press SHIFT.
4. Press hyp.
5. Now, put in your complex number 2 + 2i .
6. Press =
Hmm! That is the absolute value for 2 + 2i .
To find your argument :
1. Set your calculator into complex mode (Step 1 and 2)
2. Press SHIFT.
3. Press 2.
4. Select 1.
5. Put in your complex number 2 + 2i .
6. Press = .
That is the argument for 2 + 2i . If your calculator is in the degree mode, that answer is in degree. You need to set your calculator into radian mode if you wish your answer to be in radian.