$$\text { Find the maximum value of } Q ( x ) \text { subject to the constraint } _x T _ { x = 1 } \text {. }$$

Multiple Choice

$$\text { Find the maximum value of } Q ( x ) \text { subject to the constraint } _x T _ { x = 1 } \text {. }$$
- $$Q ( x ) = 2 x _ { 1 } ^ { 2 } + 9 x _ { 2 } ^ { 2 } + 5 \times \frac { 2 } { 3 }$$

A) 2
B) 18
C) 5
D) 9