Solve the Logarithmic Equation $\log x + \log ( x + 1 ) = \log 72$

Multiple Choice

Solve the logarithmic equation. Be sure to reject any value that is not in the domain of the original logarithmic
expressions. Give the exact answer.
- $\log x + \log ( x + 1 ) = \log 72$

A) $\{ 8 \}$
B) $\{ 9 \}$
C) $\{ 9 , - 8 \}$
D) $\left\{ \frac { 73 } { 2 } \right\}$