Provide a unique real world example where quadratic equations might be used.

Question

anonymous · Answer

i dont know how i would make this into a real world situation

directrix · Answer

Ray operates a small sign-making business. He finds that if he
charges x dollars for each sign he sells 40−x signs per week.
What is the least number of signs he can sell to have an
income of $336 in one week?

directrix · Answer

http://banach.millersville.edu/~bob/math101/QuadApps/main.pdf

experimentx · Answer

good question, 
when a body is falling from height h, them height can be modeled on quadratic equation

-h + at + bt^2 = 0

experimentx · Answer

when you shoot a projectile, the path traced can be modelled with a quadratic equation

- y + bx + cx^2 = 0

experimentx · Answer

anything that looks like parabolic or parabola ... can be modeled on quadratic equation

anonymous · Answer

well, the orbit of the earth around the sun is elliptical....
and we can write a quadratic equation for that orbit which is an equation for an ellipse given by,
$$(x^2/a^2)+(y^2/b^2)=1$$

directrix · Answer

@felixsalter --> do you need the solution?