Term 2

Quadratic Equations
A=\left[\begin{array}{lll} 0 & 1 & 3 \\ 1 & 2 & x \\ 2 & 3 & 1 \end{array}\right], A^{-1}=\left[\begin{array}{ccc} \frac{1}{2} & -4 & \frac{5}{2} \\ -\frac{1}{2} & 3 & -\frac{3}{2} \\ \frac{1}{2} & y & \frac{1}{2} \end{array}\right]