Find the Second Derivative for the Function $f ( x ) = \frac { 7 x } { 7 x + 3 }$

Multiple Choice

Find the second derivative for the function $f ( x ) = \frac { 7 x } { 7 x + 3 }$ and solve the equation $f ^ { \prime \prime } ( x ) = 0$ .

A) 0
B) 3
C) no solution
D) -3
E) $- \frac { 1 } { 3 }$