#1**+1 **

It really just comes with time and practice. The denominator is very easy, assume we have ax^2+bx+c. Right away the denimonator is 2*a, that's it! The numorater is harder, think of it as:

Minus the middle coeficient (-b)

Plus Minus

Sqrt of ((b again :D)^2 - (4*(The other two coefficents not mentioned before in the numerator (a*c)))

Hope that helps!

Guest Jun 7, 2021