To calculate impedance using the formula Z = R + jX, one must understand that resistance (R) remains constant at 4.7 kΩ regardless of frequency changes, such as at 10 Hz, 100 Hz, 1 kHz, or 10 kHz. The discussion emphasizes that unless a non-ideal resistor model is provided, frequency does not affect the resistance value. The imaginary component (reactance, X) would need to be determined separately based on the circuit elements involved. Therefore, the impedance calculation simplifies to Z = 4.7 kΩ + jX, where X is dependent on the specific circuit configuration. Understanding these principles is crucial for accurately calculating impedance in various scenarios.