Answer:
[tex] - \frac{25}{4} [/tex]
Step-by-step explanation:
[tex] \frac{1}{2} - 3( \frac{1}{2} + 1 {)}^{2} [/tex]
[tex] \frac{1}{2} - 3 \times ( \frac{3}{2} {)}^{2} [/tex]
[tex] \frac{1}{2} - 3 \times \frac{9}{4} [/tex]
[tex] \frac{1}{2} - \frac{27}{4} [/tex]
[tex] - \frac{25}{4} [/tex]
