Use a Change of Base Formula to Evaluate the Given $\log _ { 5 } ( x + 7 ) + \log _ { 5 } ( x - 7 ) = 1$

Multiple Choice

Use a change of base formula to evaluate the given logarithm. Approximate to three decimal places.
- $\log _ { 5 } ( x + 7 ) + \log _ { 5 } ( x - 7 ) = 1$

A) 54
B) $\frac { 246 } { 5 }$
C) 5
D) $3 \sqrt { 6 }$