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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.

Apr 13, 2020

#1
0

The possible values of k are 3 and 8.

Apr 14, 2020
#2
-1

it's wrong but i have one more attempt...help!

Guest Apr 14, 2020