Question

решить уравнение 3х в квадрате+9х=0​

Answer 1

$3 {x}^{2} + 9x = 0 \\ \\ \\ 3x(x + 3) = 0 \\ \\ \\ 3x = 0 \\ x + 3 = 0 \\ \\ \\ x_{1} = 0. \\ x_{2} = - 3.$