A: In mathematics, a quadratic equation is a polynomial equation of the second degree. The general form is:
ax^2+bx+c=0,\,
where x represents a variable, and a, b, and c, represent coefficients and constants, with a ≠ 0. (If a = 0, the equation becomes a linear equation.)
The constants a, b, and c, are called respectively, the quadratic coefficient, the linear coefficient and the constant term or free term. Quadratic comes from quadratus, which is the Latin word for "square."
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