If the matrix $A=\left[\begin{array}{cc}2-x & +3 \\ 2 & 1-x\end{array}\right]$ is singular, then value(s) of x are:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → -1, 4
$|A|=0$ (singular)
$(2-x)(1-x)-2×3=0$
$x^2-3x+2-6=0$
$x^2-3x-4=0$
$(x-4)(x+1)=0$
$x=4,-1$