(Solved): (2 points) Find a value of the constant \( k \) such that the indicated limit exists. \[ \lim _{x \ ...

(2 points) Find a value of the constant \( k \) such that the indicated limit exists. \[ \lim _{x \rightarrow \infty} \frac{7^{x}-7}{e^{k x}+8} \] \[ k= \] (if any value of \( k \) will work, enter any; if none will work, enter none.) Are there any other values of \( k \) that will work?