Quadratic Form
A quadratic form is a second-degree polynomial expressed as a linear combination of terms.
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Description
The coefficients of a polynomial like ax2 + bxy + cy2 can also be expressed by matrix:
There are infinitely many solutions to x1,2 + x2,1 = b but by convention only x1,2 = b/2 is considered, as this gives a symmetric matrix.
It follows that a polynomial can be expressed as:
