Ответ: -4.84
\[4a(3 - a) - (3a + 2)^2 = 4 \cdot 0.2(3 - 0.2) - (3 \cdot 0.2 + 2)^2 = 0.8(2.8) - (0.6 + 2)^2 = 2.24 - (2.6)^2 = 2.24 - 6.76 = -4.52\]
Ответ: -4.52