Question

Resolva as equações

a) $x^{2} +x =0$

b) $3x^{2} +7x =0$

c) $5x^{2} -x=0$

d) $3x^{2} +15x=0$

ME AJUDEM POR FAVOR !!

Answer 1

Explicação passo-a-passo:

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

${3x}^{2} + 7x = 0 > x (3x + 7) = 0 > x1 = 0 \: x2 = - \frac{7}{3}$

${5x}^{2} - x = 0 > x(5 - 1) = 0 > x1 = 0 \: x2 = - \frac{ 1}{5}$

${3x}^{2} + 15x = 0 > x(3x + 15) = 0 > x1 = 0....x2 = 3x + 15 = 0 > 3x = - 15 > x = \frac{ - 15}{3} > x = - 5$