Need functions to solve 2 basic math problems

I need 2 functions 1) Solve a set of 3 equations and 3 unknows in the form of [M]x = [b] double [3] Solve3x3Equations( double [3,3] M, double [3] b ) { } 2) Solve for the roots of ax^3 + bx^2 + cx + d = 0 double [3] SolveRoots( double a, double b, double c, double d) { } in c++ or C# ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): Functions that compile in Miscrosoft Visual Studio 2005 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform C# or C++ Microsoft Visual Studio 2005