Find the Function Value $f ( x ) = 5 ^ { x }$

Multiple Choice

Find the function value.
-Let $f ( x ) = 5 ^ { x }$ . Find $f ( - 2 )$ .

A) $\frac { 1 } { 32 }$
B) $- \frac { 1 } { 10 }$
C) $\frac { 1 } { 25 }$
D) $- 10$