Explicação passo-a-passo:
[tex]a)5x {}^{2} - 3125 = 0 \\ 5x {}^{2} = 3125 \\ x {}^{2} = \frac{3125}{5} \\ x {}^{2} = 625 \\ x = \sqrt{625 } \\ x = 25 \\ s = ( \: \: - 25 \: \: \: 25) \\ \\ b)9x {}^{2} - 3x = 0 \\ x(9x - 3) = 0 \\ x = 0 \\ 9x - 3 = 0 \\ 9x = 3 \\ x = \frac{3}{9} \\ x = \frac{1}{3} \\ s = (0 \: \: \: \frac{1}{3}) \\ \\ c)4x {}^{2} = 0 \\ x {}^{2} = \frac{0}{4} \\ x {}^{2} = 0 \\ x = \sqrt{0} \\ x = 0 \\ s = (0)[/tex]
