Math Problem Statement

Represent the complex number 2 + 3𝑖 and its conjugate on a complex plane.

Solution

To represent the complex number z=2+3iz = 2 + 3i and its conjugate on the complex plane:

  1. Complex Number z=2+3iz = 2 + 3i:

    • This number has a real part of 2 and an imaginary part of 3.
    • On the complex plane, the x-axis (horizontal) represents the real part, and the y-axis (vertical) represents the imaginary part.
    • So, the point (2,3)(2, 3) corresponds to zz, where 2 is the real part and 3 is the imaginary part.
  2. Conjugate zΛ‰=2βˆ’3i\bar{z} = 2 - 3i:

    • The conjugate of zz is obtained by changing the sign of the imaginary part.
    • In this case, z=2+3iz = 2 + 3i and its conjugate zΛ‰=2βˆ’3i\bar{z} = 2 - 3i has the same real part but the imaginary part is βˆ’3-3.
    • So, zΛ‰\bar{z} is represented by the point (2,βˆ’3)(2, -3) on the complex plane.

Plotting on the Complex Plane:

  • Plot the point (2,3)(2, 3) for z=2+3iz = 2 + 3i.
  • Plot the point (2,βˆ’3)(2, -3) for the conjugate zΛ‰=2βˆ’3i\bar{z} = 2 - 3i.
  • The two points will be symmetric about the real axis (x-axis).

Would you like a visual representation of this complex plane?


Here are some relative questions to further your understanding:

  1. What is the magnitude of the complex number z=2+3iz = 2 + 3i?
  2. How would you add two complex numbers like z1=2+3iz_1 = 2 + 3i and z2=1+4iz_2 = 1 + 4i?
  3. What is the result of multiplying z=2+3iz = 2 + 3i by its conjugate?
  4. How do you interpret the argument (angle) of a complex number in the complex plane?
  5. Can you generalize the rule for finding the conjugate of any complex number?

Tip: The conjugate of a complex number reflects it across the real axis on the complex plane.

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Math Problem Analysis

Mathematical Concepts

Complex Numbers
Imaginary Numbers
Complex Plane

Formulas

Conjugate of a complex number: \(\bar{z} = a - bi\)

Theorems

Conjugate Reflection Theorem

Suitable Grade Level

Grades 10-12