No Barriers to ExcelCalcs

Find the roots of polynominal equations with Purpose Excel Functions. Author Doug Jenkins.

Quartic - ax^4 + bx^3 + cx^2 + dx +e = 0
=quartic(a, b, c, d, e, Output Index -1 to 5 (optional))
Cubic - ax^3 + bx^2 + cx + d = 0
=cubic(a, b, c, d, Output Index -1 to 4 (optional))
CubicCa - x^3 + bx^2 + cx + d = 0
=cubicC(a, b, c, d, Output Index -1 to 4 (optional))
Quadratic - ax^2 + bx + c = 0
=quadratic(a, b, c, Output Index 1to 3(optional))

Useful maths functions from Doug Jenkins.

Function IP: Finds the intersection points of two 2D lines or polylines;
Function IPLC: Finds the intersection points of a 2D line and a circle;
Function IPCC: Finds the intersection points of two circles;
Function IPSSS: finds the 3D intersection points of three spheres;
Function IPSS: finds the location and radius of the intersection circle of two spheres;
Function RtoP, PtoR: Converts rectangular to polar coordinates and polar to rectangular;
Function Rotate: Rotates 2D or 3D rectangular axes about any axis;
Function Interp, Interp2, Loginterp, Loginterp2, Quadinterp: One way and 2 way linear, log interpolation and quadratic interpolation.