= 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 ''ax^2^ + bxy + cy^2^'' can also be expressed by matrix:

{{attachment:coef.svg}}

There are infinitely many solutions to ''x,,1,2,, + x,,2,1,, = b'' but by convention only ''x,,1,2,, = b/2'' is considered, as this gives a symmetric matrix.

It follows that a polynomial can be expressed as:

{{attachment:poly.svg}}



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CategoryRicottone