Find the Zeroes of the Functions Algebraically $$f ( x ) = \sqrt { 5 x } - 9$$

Multiple Choice

Find the zeroes of the functions algebraically.? $$f ( x ) = \sqrt { 5 x } - 9$$ ?

A) $x = \pm \frac { 9 } { 5 }$
B) $$x = \pm \frac { 81 } { 5 }$$
C) ? $x = \frac { 9 } { 5 }$
D) ? $x = \frac { 81 } { 5 }$
E) ?no real zeroes