Let
\[ B(t) = 4 \log _{2}(5t - 3) - 1 \]
\[ \lim \limits _{t \to \infty } B(t) = \answer {\infty } \]
\[ \lim \limits _{t \to \frac {3}{5}^+} B(t) = \answer {-1} \]
Let
\[ h(z) = 4 \ln (-5z - 3) - 1 \]
\[ \lim \limits _{z \to -\infty } h(z) = \answer {\infty } \]
\[ \lim \limits _{z \to \frac {-3}{5}^-} h(z) = \answer {-\infty } \]