Question

The value of $x$ satisfying the equation $2\left[\begin{array}{cc}3& 1\\ 1& 2\end{array}\right]+$ $\left[\begin{array}{cc}{x}^2& 9\\ -1& 0\end{array}\right]=$ $\left[\begin{array}{cc}5x& 6\\ 0& 1\end{array}\right]+$ $\left[\begin{array}{cc}0& 5\\ 1& 3\end{array}\right]$are

• A. $1,2$
• B. $2,3$
• C. $\pm 2$
• D. $\pm 3$

Answer 1

The correct option is B $2,3$

By comparing, we have

$6+x^2=5x$ or $x^2-5x+6=0$
or $(x-2)(x-3)=0$
$\therefore x=2,3$