Math Problem Statement

If Arg(z) = π, what does Arg(\bar{z}) equal?

Solution

The image contains a mathematical question in Arabic involving the argument of a complex number zz and its conjugate zˉ\bar{z}. Here's the content translated and analyzed:


Question:
If Arg(z)=π\text{Arg}(z) = \pi, what does Arg(zˉ)\text{Arg}(\bar{z}) equal?


Solution:

  1. Argument of a complex number zz:
    The argument Arg(z)\text{Arg}(z) of a complex number z=x+iyz = x + iy is the angle θ\theta between the positive real axis and the line connecting the origin to zz in the complex plane.

  2. Conjugate of zz:
    The conjugate zˉ\bar{z} of z=x+iyz = x + iy is given by zˉ=xiy\bar{z} = x - iy. This reflection of zz occurs across the real axis.

  3. Effect of conjugation on the argument:
    The argument of zˉ\bar{z}, denoted Arg(zˉ)\text{Arg}(\bar{z}), is the negative of the argument of zz, because the conjugation reflects zz across the real axis.

    Mathematically:
    Arg(zˉ)=Arg(z)\text{Arg}(\bar{z}) = -\text{Arg}(z)

  4. Given Arg(z)=π\text{Arg}(z) = \pi:
    Substituting into the formula:
    Arg(zˉ)=π\text{Arg}(\bar{z}) = -\pi

  5. Principal argument range:
    The principal argument of a complex number is usually restricted to (π,π](-\pi, \pi]. Since π-\pi lies within this range, we can accept Arg(zˉ)=π\text{Arg}(\bar{z}) = -\pi as the final answer.


Final Answer:

Arg(zˉ)=π\text{Arg}(\bar{z}) = -\pi


Do you want further clarification or details? Here are related questions to expand on this topic:

  1. What is the geometric meaning of the argument of a complex number?
  2. How does the conjugate of a complex number affect its position on the complex plane?
  3. What is the principal argument range of a complex number?
  4. If Arg(z)=π4\text{Arg}(z) = \frac{\pi}{4}, what is Arg(zˉ)\text{Arg}(\bar{z})?
  5. How can you graphically represent zz and zˉ\bar{z} when Arg(z)=π\text{Arg}(z) = \pi?

Tip: The argument of a complex number can change when reflected, rotated, or scaled—be mindful of the principal range (π,π](-\pi, \pi].

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Math Problem Analysis

Mathematical Concepts

Complex Numbers
Arguments of Complex Numbers
Complex Conjugates

Formulas

Arg(\bar{z}) = -Arg(z)
Principal argument range: (-π, π]

Theorems

Reflection of a complex number conjugate across the real axis

Suitable Grade Level

Grade 10-12