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PHP Script Codes > Quadratic Equation Solver (and more!)
The Quadratic Equation Solver posted on this page solves for both real and imaginary (if applicable) results.
Also on this site: solvers for the Cubic and Quartic equations, N Equations in N Unknowns, Eigenvalues and Eigenvectors, Cubic Spline Interpolation, Numerical Integration, and Least-Squares Data-Fitting.