If the matrix A =![\left[\begin{array}{ccc}2&1&-1\\1&0&4\\-1&4&3\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D2%26amp%3B1%26amp%3B-1%5C%5C1%26amp%3B0%26amp%3B4%5C%5C-1%26amp%3B4%26amp%3B3%5Cend%7Barray%7D%5Cright%5D "\left[\begin{array}{ccc}2&1&-1\\1&0&4\\-1&4&3\end{array}\right]")
then find quadratic form of the matrix A.
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