Definitions for quadratic equation
Random House Webster's College Dictionary
an equation containing a single variable of degree 2. Its general form is ax2+bx+c= 0, where x is the variable and a, b, and c are constants (a≠ 0).
Origin of quadratic equation:
quadratic equation, quadratic(noun)
an equation in which the highest power of an unknown quantity is a square
a polynomial equation of the second degree.
The Nuttall Encyclopedia
an equation involving the square of the unknown quantity.
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