Let
$$f(s) = \begin{cases}
s^2 - c & \text{if } s \in (-\infty, 4) \\
cs + 2 & \text{if } s \in [4, \infty)
\end{cases}$$
For what value of the constant c is the function f continuous on (-∞,∞)?
c =
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Hint: Compute $$\lim_{s \to 4^+} f(s)$$ and $$\lim_{s \to 4^-} f(s)$$.