Find the modulus and argument of the following complex numbers and hence express each of them in the polar form :

Question

Find the modulus and argument of the following complex numbers and hence express each of them in the polar form : 1 – i

Philoid · Accepted Answer

Given complex number is z=1-i

We know that the polar form of a complex number Z=x+iy is given by Z=|Z|(cosθ+isinθ)

Where,

|Z|=modulus of complex number=

θ =arg(z)=argument of complex number=

Now for the given problem,

⇒

Since x>0,y<0 complex number lies in 4^th quadrant and the value of θ will be as follows -90⁰≤θ≤0⁰.

⇒

⇒ .

⇒

∴ The Polar form of Z=1+i is .