For the Function, Find the Average Rate of Change of F

Multiple Choice

For the function, find the average rate of change of f from 1 to x: $\frac { f ( x ) - f ( 1 ) } { x - 1 } , x \neq 1$
- $f ( x ) = \sqrt { x + 63 }$

A) $\frac { \sqrt { x + 63 + 8 } } { x - 1 }$
B) $\frac { \sqrt { x + 63 } + 8 } { x + 1 }$
C) $\frac { \sqrt { x + 63 } - 8 } { x - 1 }$
D) $\frac { \sqrt { x + 63 } - 8 } { x + 1 }$