Question

me ajudem ai pfvr?!​

Answer 1

Resposta:

$a) {x}^{2} + 5x = 0 \\ x \times (x + 5) = 0 \\ x = 0 \\ ou \\ x + 5 = 0 \\ x = - 5 \\ \\ x1 = 0 \\ x2 = - 5$

$b) {4x}^{2} - 9x = 0 \\ x \times (4x - 9) = 0 \\ x = 0 \\ ou\\ 4x - 9 = 0 \\ 4x = 9 \\ x = \frac{9}{4} \\ \\ x1 = 0 \\ x2 = \frac{9}{4}$

$c)3 {x}^{2} + 5x = 0 \\ x \times (3x + 5) = 0 \\ x = 0 \\ ou \\ 3x + 5 = 0 \\ 3x = - 5 \\ x = - \frac{5}{3} \\ \\ x1 = 0 \\ x2 = - \frac{5}{3}$

$d)4 {x}^{2} - 12x = 0 \\ x \times (4x - 12) = 0 \\ x = 0 \\ ou \\ 4x - 12 = 0 \\ 4x = 12 \\ x = 3 \\ \\ x1 = 0 \\ x2 = 3$

$e)5{x}^{2} + x = 0 \\ x \times (5x + 1) = 0 \\ x = 0 \\ ou \\ 5x + 1 = 0 \\ 5x = - 1 \\ x = - \frac{1}{5} \\ \\ x1 = 0 \\ x2 = - \frac{1}{5}$

$f) {x}^{2} + x = 0 \\ x \times (x + 1) = 0 \\ x = 0 \\ ou \\ x + 1 = 0 \\ x = - 1 \\ \\ x1 = 0 \\ x2 = - 1$