Cause the middle school one is the quadratic formula. You use it to factor 2nd degree polynomials. You don’t solve for a, b, and c, you just plug them in.

It is the quadratic formula. It already is the solution. The problem is any quadratic of the form ax²+bx+c=0

Wow. In America, trades people use a chart to look up literally anything that requires math. If you’re lucky.

Most of the time “it looks good enough” is enough.

Had to try to find a source

Maybe you were just at a bad school? Quadratic equations are mandatory in Germany even for the lowest level of graduation.

Until my Abitur (12th grade) I learned about equations, stochastics, integrals and derivatives, vector stuff, etc.

not sure why you’re getting downvoted for this, I had the same experience with my education in the US. high school class of 08, lol. the school never taught a math class past algebra 1. if you finished it, you still needed math credits per year, so they’d just have you retake the same class. seriously. absolutely abysmal. 95% of the math I do now is self taught. from my “education” alone, we never got much past solving basic linear single-variable equations. most of my class graduated barely literate. really, most of my class simply left, myself included - the dropout rate was astonishingly high around 08, and instead of doing the same classes and curriculum for the third time in my senior year, I opted to simply leave, educate myself, and shortly thereafter start my business.