Question

$x=\left|\begin{array}{c}-1-2-2\\ 21-2\\ 2-21\end{array}\right|$, then $x=$

• A. $20$
• B. $21$
• C. $22$
• D. $23$

Answer 1

The correct option is D $23$

$x=\left|\begin{array}{c}-1-2-2\\ 21-2\\ 2-21\end{array}\right|$

$x=-1(1-4)+2(2+4)-2(-4-2)x=-1(-3)+8+12=23$