luckyalita luckyalita
  • 20-05-2018
  • Mathematics
contestada

Write each of the following expressions without using absolute value. |z−7|−|z−9|, if z<7

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sqdancefan
sqdancefan sqdancefan
  • 20-05-2018
Here is one way.

[tex]\left\{ \begin{array}{rcl}-2&\mbox{for}&z < 7\\2(z-8)&\mbox{for}&7\le z\le9\\2&\mbox{for}&9 < z\end{array}\right\,[/tex]
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