The given equation is \( z = a - i \), where \( z \) is a complex number and \( a \) is a real number.

This complex number can be expressed in standard form as:

\[
z = a - i
\]

In the standard form of a complex number \( z = x + yi \), \( x \) represents the real part and \( y \) represents the imaginary part. From this, we can identify:

- The real part of \( z \) is \( \text{Re}(z) = a \).
- The imaginary part of \( z \) is \( \text{Im}(z) = -1 \) (since \( -i \) corresponds to \( -1 \cdot i \)).

Do you want more details on how to represent or manipulate this complex number?

### Related Questions:
1. What is the magnitude of the complex number \( z = a - i \)?
2. How do you represent \( z = a - i \) on the complex plane?
3. What is the argument (angle) of \( z = a - i \)?
4. How do you add or subtract two complex numbers?
5. How do you multiply \( z = a - i \) by another complex number?

### Tip:
The magnitude of a complex number \( z = x + yi \) is given by \( |z| = \sqrt{x^2 + y^2} \).

Explore the properties of the complex number z = a - i, including identifying the real and imaginary parts, calculating the magnitude, and representing it on the complex plane. Learn key concepts in complex number algebra suitable for Grades 10-12.

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