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For example the sum of squares can be expressed in. Web expressing a quadratic form with a matrix. Web a quadratic form involving n real variables x_1, x_2,., x_n associated with the n×n matrix a=a_(ij) is given by. Web the quadratic forms of a matrix comes up often in statistical applications. Web first, if \(a=\begin{bmatrix} a \amp b \\ b \amp c \end{bmatrix}\text{,}\) is a symmetric matrix, then the associated. How to write an expression. Given a matrix a of n demeaned data points, the symmetric covariance matrix c = 1 naat.