[tigerlily]

I once wondered what happens when you take x away from x squared, and let that equal 1.

I sat down and worked it out. What do you know golden ratio.

Oh and this other number, -0.618. Anyone know what it's good for?

[x1000]

It’s the negative of the inverse of the golden ratio. (Also 1 minus the golden ratio.) So, good for anything the golden ratio itself is good for.

[e9]

0.618 is used as level for trading with fibonacci retracements: https://centerpointsecurities.com/fibonacci-retracements/