$$-2 \cdot (\frac{3}{2})^2 = -2 \cdot \frac{3^2}{2^2} = -2 \cdot \frac{9}{4} = -\frac{2 \cdot 9}{4} = -\frac{18}{4} = -\frac{9}{2} = -4.5$$
Ответ: -4.5