Find an Equation of the Tangent Line to the Graph $f ( x ) = 2 \sqrt { x }$

Multiple Choice

Find an equation of the tangent line to the graph of the function $f ( x ) = 2 \sqrt { x }$ at the point that has x-coordinate $x = 36$ . [Hint: use point-slope formula to find the equation of the tangent line.]

A) $y = - \frac { x } { 6 } - 6$
B) $y = \frac { x } { 6 } + 6$
C) $y = 6 x + 6$
D) $y = 6 x + \frac { 1 } { 6 }$
E) $y = \frac { x } { 36 } + 6$