work with the scale and offset in add / subtract

Can anyone give a more definitive explanation of the use of scale / offset in the area add / subtract from the fields please? I always tend to go by trial and error when you use them, which gets results, but it is one of these in photoshop that my lack of technical knowledge frustrate me in the region. My understanding is that the offset increases / decreases the brightness in all areas, which works as expected. Scale, not so sure, on the interaction of the two... much less clear lol

Help from photoshop:

https://helpx.Adobe.com/Photoshop/using/channel-calculations.html

Tags: Photoshop

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