If z = 2 + 2i, find the value of z/z*.

Practice Questions

Q1
If z = 2 + 2i, find the value of z/z*.
  1. 1
  2. 2
  3. i
  4. 2i

Questions & Step-by-Step Solutions

If z = 2 + 2i, find the value of z/z*.
Correct Answer: i
  • Step 1: Identify the complex number z. Here, z = 2 + 2i.
  • Step 2: Find the conjugate of z, denoted as z*. The conjugate of z = 2 + 2i is z* = 2 - 2i.
  • Step 3: Set up the expression z/z*. This means we will divide z by its conjugate: (2 + 2i) / (2 - 2i).
  • Step 4: Multiply the numerator and the denominator by the conjugate of the denominator to simplify. This gives us: (2 + 2i)(2 + 2i) / (2 - 2i)(2 + 2i).
  • Step 5: Calculate the denominator: (2 - 2i)(2 + 2i) = 2^2 - (2i)^2 = 4 - (-4) = 4 + 4 = 8.
  • Step 6: Calculate the numerator: (2 + 2i)(2 + 2i) = 2^2 + 2*2*2i + (2i)^2 = 4 + 8i - 4 = 8i.
  • Step 7: Now we have (8i) / (8).
  • Step 8: Simplify the fraction: 8i / 8 = i.
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