luckyalita luckyalita

20-05-2018
Mathematics

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

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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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