- Maximum value: \( 6 \) at \( x = \text{None} \)
- Minimum value: \( \text{None} \)
- Increasing intervals: \( (-\infty, -7) \) and \( (1, \infty) \)
- Decreasing interval: \( (-7, -2) \)
- Domain: \( (-\infty, \infty) \)
- Range: \( (-\infty, \infty) \)
Thus, the final boxed answers are:
\[
\boxed{\text{Maximum value: } 6}
\]
\[
\boxed{\text{Minimum value: None}}
\]
\[
\boxed{\text{Increasing intervals: } (-\infty, -7) \text{ and } (1, \infty)}
\]
\[
\boxed{\text{Decreasing interval: } (-7, -2)}
\]
\[
\boxed{\text{Domain: } (-\infty, \infty)}
\]
\[
\boxed{\text{Range: } (-\infty, \infty)}
\]