The modulus of the complex number z such that |z+3-i|= 1 and arg (z)= ...
Modulus of a Complex Number with Given Conditions
To find the modulus of the complex number z with the given conditions, we will use the following steps:
Step 1: Write the Complex Number in Polar Form
We know that the modulus of a complex number is given by |z| = √(x² + y²) and the argument of a complex number is given by arg(z) = tan⁻¹(y/x). Therefore, we can write the complex number z in polar form as:
z = |z| (cosθ + i sinθ)
where |z| is the modulus of z and θ is the argument of z.
Step 2: Use the Given Conditions to Find |z| and θ
We are given that |z 3-i| = 1, which means that the distance between z and the point (3, -1) in the complex plane is 1. Therefore, we can write:
|z - (3 - i)| = 1
This represents a circle with center (3, -1) and radius 1 in the complex plane. We are also given that the argument of z is π, which means that z lies on the negative real axis.
Therefore, we can write z in polar form as:
z = |z| (cosπ + i sinπ) = -|z|
This means that the real part of z is -|z| and the imaginary part is 0.
Step 3: Find |z|
Substituting z in the equation |z - (3 - i)| = 1, we get:
|-|z| - (3 - i)| = 1
|-|z| + 3 - i| = 1
This represents a circle with center (-3, i) and radius 1 in the complex plane. We know that z lies on the negative real axis, which means that the distance between z and (-3, i) is |z| + 3.
Therefore, we can write:
|z| + 3 = 1
|z| = -2
Since the modulus of a complex number is always a positive number, this is not a valid solution. Therefore, there is no complex number z that satisfies the given conditions.
Final Answer:
There is no complex number z that satisfies the given conditions.