Solve the Equation $\log _ { 72 } \left( x ^ { 2 } - x \right) = 1$

Multiple Choice

Solve the equation.
- $\log _ { 72 } \left( x ^ { 2 } - x \right) = 1$

A) $\{ - 8,9 \}$
B) $\{ 1,72 \}$
C) $\{ - 8 , - 9 \}$
D) $\{ 8,9 \}$