Question

4 x elevado ao quadrado + 10x = 0

Answer 1

$4 {x}^{2} + 10x = 0 \\ x(4x + 10) = 0 \\ x = 0 \: ou \: 4x + 10 = 0 \: \\ \\ 4x + 10 = 0 \\ 4x = - 10 \\ x = \frac{ - 10}{4} = \frac{ - 5}{2}$

Logo,
$x = 0 \: ou \: x = \frac{ - 5}{2} .$