Let $y = \frac { u - 2 } { u + 3 }$

Multiple Choice

Let $y = \frac { u - 2 } { u + 3 }$ and $u = 2 x + 1$ By the Chain Rule, $\frac { d y } { d x }$ is

A) $\frac { 4 x + 7 } { ( 2 x + 4 ) ^ { 2 } }$
B) $\frac { 4 x - 7 } { ( 2 x + 4 ) ^ { 2 } }$
C) $\frac { 10 } { ( 2 x + 4 ) ^ { 2 } }$
D) $- \frac { 5 } { ( 2 x + 4 ) ^ { 2 } }$
E) $\frac { 5 } { ( 2 x + 4 ) ^ { 2 } }$