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Calculating extrema of a given function on a geometrical region

I've never used Mathematica before. Now I have to figure out, for one of my classes, how to find the max and min of the function $f(x,y)=x^3+2\ xy$ over the triangular region of the plane with ...
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Writing a function to set up and solve the least squares problem

I have setup the explicit line equation for a given set of points using least-squares approximation and the knots computed below. I have tried extending the same code for use with an arbitrary degree, ...
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Gauss-Jordan program in Mathematica

Hi to everyone I made this program to solve a linear system by Gauss Jordan, this is my code to solve the system: ...