Solve the Equation $$\log _ { 7 } \left( x ^ { 2 } - 6 x \right) = 1$$

Multiple Choice

Solve the equation.
- $$\log _ { 7 } \left( x ^ { 2 } - 6 x \right) = 1$$

A) $\{ 7 , - 1 \}$
B) $\{ 7 \}$
C) $\{ - 7,1 \}$
D) $\{ 1 \}$