تابع $f\left( x \right)=\left\{ \begin{matrix} x-5\,\,\,\,\,\,\,\,\,\,\,\,\,x\ge 5 \\ 5-x\,\,\,\,\,\,\,\,\,\,\,x\lt 5 \\\end{matrix} \right.$ را به کدام صورت میتوان نشان داد؟
$f\left( x \right)=\left| x-5 \right|$
2 )
$f\left( x \right)=\left| x+5 \right|$
3 )
$f\left( x \right)=-\left| x-5 \right|$
4 )
$f\left( x \right)=-\left| x+5 \right|$