The quadratic equation is an ancient staple of mathematics that dates back to ancient Babylonians in 2000 BC. It was originally devised as a way to help calculate problems involving rectangles ...

Arnold E. Ross, On Representation of Integers by Indefinite Ternary Quadratic Forms of Quadratfrei Forms of Quadratfrei Determinant, American Journal of Mathematics, Vol. 55, No. 1 (1933), pp. 293-302 ...