the.com/quadratic equation

means An equation where the highest power of the unknown is squared (ax² + bx + c = 0), typically solved for two values using factoring, completing the square, or the quadratic formula.

from From Latin 'quadratus' (squared), past participle of 'quadrare' (to make square), rooted in 'quattuor' (four) — because a square has four equal sides. The math is ancient: Babylonian scribes were solving quadratic-style problems with geometric methods millennia before algebra existed, and later Islamic mathematicians, notably al-Khwarizmi, formalized the systematic solving techniques that evolved into today's formula. The word 'quadratic' itself entered English via Latin specifically to mean 'relating to squaring,' only later narrowing to this algebraic sense.