Find $\lim _ { h \rightarrow 0 } \frac { f ( x + h ) - f ( x ) } { h }$

Find $\lim _ { h \rightarrow 0 } \frac { f ( x + h ) - f ( x ) } { h }$ for $f ( x ) = \sqrt { x - 6 }$ .

A) $\frac { 1 } { 6 \sqrt { x - 6 } }$
B) $\frac { 1 } { 2 \sqrt { x - 6 } }$
C) $\frac { \sqrt { x - 6 } } { 2 }$
D) $\sqrt { x - 6 }$
E) limit does not exist

Correct Answer:

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