quadratic equations have almost limitless real-world applications.
not for average everyday people. maybe for a howard wallowitz or a leonard hofsteader but not for people like me who have no interest in math-based professions. i will never need something as stupid as a quadratic equation to figure out how to pay my bills properly or drive my car or handle my insurance or for nearly all average jobs.
the only reason these kinds of things are taught in the classroom is for the sake of those few and rare students who actually are gonna go on to be something like a physicist or an engineer or a college math teacher. i dont want to waste my time having to learn material that i not only hate but that is never going to have any use for me in what i want to do.