3. Найти $$f(2)$$, $$f(-5)$$, $$f(0)$$, если $$f(x) = x^2 + 18x$$.

$$f(x) = x^2 + 18x$$ $$f(2) = 2^2 + 18 \cdot 2 = 4 + 36 = 40$$ $$f(-5) = (-5)^2 + 18 \cdot (-5) = 25 - 90 = -65$$ $$f(0) = 0^2 + 18 \cdot 0 = 0 + 0 = 0$$ Ответ: $$f(2) = 40$$, $$f(-5) = -65$$, $$f(0) = 0$$