The Graph Of $f ( x ) = 3 x ^ { 4 } - 2 x ^ { 3 } - 12 x ^ { 2 } + 18 x - 5$

True/False

The graph of $f ( x ) = 3 x ^ { 4 } - 2 x ^ { 3 } - 12 x ^ { 2 } + 18 x - 5$ is concave up for $x < \frac { 2 } { 3 }$ .