Weighted / Non-weighted Quadratic Curve Fit to Point Set

While reading Walking Randomly yesterday, I came about this post on polynomial fitting with MATLAB, which went along with something I was working on in MathCAD and the next thing I new I worked the problems long hand, figured I might as well post them for someone else to find.
It took longer to decide how to post this than it did to flesh out the math. I couldn’t find a good way to post the MathCAD worksheet and settled for printing to the Snag-IT printer. If anyone knows a saner way, please let me know.

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