Решите уравнение 4x^2+12x+9=0.

\[4x² + 12x + 9 = 0\]

\[(2x + 3)^{2} = 0\]

\[2x + 3 = 0\]

\[2x = - 3\]

\[x = - \frac{3}{2} = - 1,5\]

\[Ответ:\ x = - 1,5.\]