People were spending money they didn’t really have (due to credit being a new thing) and everything was basically a party until 1929
The right question is

now multiply 1/2 by the coefficient of x which is 8

now add square of 4 on both side of equation we will get



taking square root on both sides
we get




so third option is correct
if u find any confusion u can ask me
i hope you will understand it
Thank u
I honestly don’t know, I don’t research things that don’t influence or help me directly.