Question

resolva as equações a seguir
$3 { {x}^{2} } + 15x = 0$

Answer 1

$3x^2+15x=0 \\ \\ incompleta~~calcular~~fatorando \\ \\ x(3x+15)=0 \\ \\ 3x+15=0~~~~~~x=0 \\ 3x=-15 \\ x=-15\div3 \\ x=-5 \\ \\ S=\{-5,0\}$