Find the Zeros of the Function Algebraically $f ( x ) = 9 x ^ { 2 } + 21 x - 18$

Multiple Choice

Find the zeros of the function algebraically.
$f ( x ) = 9 x ^ { 2 } + 21 x - 18$

A) $x = \frac { 2 } { 3 } , - 3$
B) $x = - \frac { 2 } { 3 } , - 3$
C) $x = \frac { 3 } { 2 } , - 3$
D) $x = \frac { 2 } { 3 } , 3$
E) $x = - \frac { 2 } { 3 } , 3$