For what value of `x` the matrix `A` is singular? `A=[1+x7 3-x8]` (ii) `A=[x-1 1 1 1x-1 1 1 1x-1]`

Answer

i) `x=13/15`

ii) `x=-1` or `2`

Explanation

Question i)


Matrix A will be singular if `[A]=0`
$$
\begin{aligned}
&|A|=\left|\begin{array}{lr}
1+x & 7 \\
3-x & 8
\end{array}\right|=0 \\
...