Use the Definition of a Logarithm to Solve Logarithmic Equations $$\log _ { 4 } x + \log _ { 4 } ( x - 15 ) = 2$$

Multiple Choice

Use the Definition of a Logarithm to Solve Logarithmic Equations
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.
- $$\log _ { 4 } x + \log _ { 4 } ( x - 15 ) = 2$$

A) $\{ 16 \}$
B) $\{ 4 \}$
C) $\{ 1 , - 16 \}$
D) $\{ - 1,16 \}$