Application of Derivatives

Let $$f:R \to R$$ be defined by $f\left( x \right) = \left\{ {\matrix{ {k - 2x,\,\,if} & {x \le - 1} \cr {2x + 3,\,\,if} & {x > - 1} \cr } } \right.$ If $$f$$has a local minimum at $$x=-1$$, then a possible value of $$k$$ is