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1. Value of x making a matrix singular ●○○○○ 10 ptsFind the value of $x$ for which the matrix $\begin{pmatrix} 1 + x & 7 \\ 3 - x & 8 \end{pmatrix}$ is not invertible. Round to two decimal places.
2. Singular 2x2 matrix parameter ●○○○○ 10 ptsFor which values of $\lambda$ does $A^{-1}$ not exist, where $A=\begin{pmatrix}\lambda&1\\-1&-\lambda\end{pmatrix}$? Give all such values in increasing order.