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Quadratic Formula

The formula giving the roots of a quadratic equation

ax^2+bx+c=0
(1)

as

x=(-b+/-sqrt(b^2-4ac))/(2a).
(2)

An alternate form is given by

x=(2c)/(-b+/-sqrt(b^2-4ac)).
(3)

See also

Completing the Square, Quadratic, Quadratic Equation Explore this topic in the MathWorld classroom

Explore with Wolfram|Alpha

Cite this as:

Weisstein, Eric W. "Quadratic Formula." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/QuadraticFormula.html

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