Given that $\begin{bmatrix} 1 & x \end{bmatrix} \begin{bmatrix} 4 & 0 \\ -2 & 0 \end{bmatrix} = 0$, the value of $x$ is:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → $2$ ##
$\begin{bmatrix} 1 & x \end{bmatrix} \begin{bmatrix} 4 & 0 \\ -2 & 0 \end{bmatrix} =0$
$4 - 2x = 0$
$x = 2$