The output voltage, ( Vout ) now becomes proportional to the sum of the input voltages, V1, V2, V3 etc. Then we can modify the original equation for the inverting amplifier to take account of these new inputs thus:
Fig.2 Shows Input signal (Red wave form) and Output (Yellow Waveform)
Fig.3 Shows Input signal (Red wave form) and Output (Yellow Waveform)