Question

| -9-x|-5=12

 

Answer 1

\(\Leftrightarrow9+x-5=12.\)

\(\Leftrightarrow x=12+5-9\)

\(\Rightarrow x=8\)

Vậy \(x=8\)

Answer 2

|-9 - x| - 5 = 12

    |-9 - x| = 12 + 5

    |-9 - x| = 17

=> -9 - x = 17           => x = -26

     -9 - x = -17          => x = 8

Answer 3

|-9-x|-5=12

|-9-x|=12+5

|-9-x|=17\(\Leftrightarrow\orbr{\begin{cases}-9-x=17\\-9-x=-17\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=-26\\x=8\end{cases}}\)

Vậy \(x\in\left[8;-26\right]\)

Answer 4

\(\left|-9-x\right|-5=12\)

\(\left|-9-x\right|\)     \(=12+5\)

\(\left|-9-x\right|\)     \(=17\) 

\(\Rightarrow\orbr{\begin{cases}-9-x=17\\-9-x=-17\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=-26\\8\end{cases}}\)