Complex-city
If are complex numbers such that is purely imaginary then what is the value of above expression?
The answer is 1.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
We write 3 Z 2 2 Z 1 = a i (where a ∈ R ), i.e. Z 1 = 2 3 a i Z 2 :
∣ ∣ ∣ Z 1 + Z 2 Z 1 − Z 2 ∣ ∣ ∣
= ∣ ∣ ∣ 2 3 a i Z 2 + Z 2 2 3 a i Z 2 − Z 2 ∣ ∣ ∣
= ∣ 2 3 a i + 1 ∣ ∣ 2 3 a i − 1 ∣
= ( 2 3 a ) 2 + ( 1 ) 2 ( 2 3 a ) 2 + ( 1 ) 2
= 1 .