ich schreibe (x,y) statt (x1 , x2)
(x , y) * \(\begin{pmatrix} 17&6\\ 6&8\end{pmatrix}\) * \(\begin{pmatrix} x \\ y \end{pmatrix}\) = \(\begin{pmatrix} 17x+6y \\ 6x+8y \end{pmatrix}\)T * \(\begin{pmatrix} x \\ y \end{pmatrix}\)
= 17x2 +6yx + 6xy + 8y2 = 17x2 + 12xy + 8y2
Gruß Wolfgang