Compute the Maximum Profit for the Profit Function $P ( x ) = \frac { x ^ { 3 } } { 3 } - \frac { 9 } { 2 } x ^ { 2 } + 8 x$

Short Answer

Compute the maximum profit for the profit function $P ( x ) = \frac { x ^ { 3 } } { 3 } - \frac { 9 } { 2 } x ^ { 2 } + 8 x$ Enter your answer as just a real number rounded off to two decimal places (no label).