Find the Average Rate of Change of the Function From x

Multiple Choice

Find the average rate of change of the function from $$x _ { 1 } \text { to } x _ { 2 }$$
- $$f ( x ) = \sqrt { 2 x } \text { from } x _ { 1 } = 2 \text { to } x _ { 2 } = 8$$

A) $\frac { 1 } { 3 }$
B) 2
C) 7
D) $- \frac { 3 } { 10 }$