1) $$f(x) = \frac{1}{2}x^2 - 3x$$.
$$f(2) = \frac{1}{2} \cdot 2^2 - 3 \cdot 2 = \frac{1}{2} \cdot 4 - 6 = 2 - 6 = -4$$.
$$f(-3) = \frac{1}{2} \cdot (-3)^2 - 3 \cdot (-3) = \frac{1}{2} \cdot 9 + 9 = 4.5 + 9 = 13.5$$.
2) Нули функции:
$$\frac{1}{2}x^2 - 3x = 0$$
$$x(\frac{1}{2}x - 3) = 0$$
$$x_1 = 0$$
$$\frac{1}{2}x - 3 = 0$$
$$\frac{1}{2}x = 3$$
$$x_2 = 6$$
Ответ: 1) $$f(2) = -4$$, $$f(-3) = 13.5$$; 2) $$x_1 = 0$$, $$x_2 = 6$$