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==Associated symmetric bilinear form==
Quadratic forms correspond one-to-one to [[symmetric bilinear form]]s over the same space.<ref>This is true only over a field of [[characteristic (algebra)|characteristic]] different of 2, but here we consider only [[ordered field]]s which necessarily have characteristic 0.</ref> A symmetric bilinear form is also described as '''definite''', '''semidefinite''', etc. according to its associated quadratic form. A quadratic form {{math|''Q''}} and its associated symmetric bilinear form {{math|''B''}} are related by the following equations:
:<math>\, Q(x) = B(x,x) </math>
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