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The function defined by \(f(x) = \left\{ \begin{array}{cl} x + k & \text{if $x < 4$}, \\ 2x - 3 & \text{if $x \ge 4$} \end{array} \right.\)
has an inverse, and the inverse is defined for all real numbers. Enter all possible values of \(k\) separated by commas

 

The ANSWER IS NOT 3, 8

 Apr 15, 2020
 #1
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The possible values of k are -2 and 5.

 May 12, 2020

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