Resposta :
[tex]5x^2-3125=0\\\\5x^2-3125+3125=0+3125\\\\5x^2=3125\\\\\frac{5x^2}{5}=\frac{3125}{5}\\\\x^2=625\\\\x=\sqrt{625},\:x=-\sqrt{625}\\\\x=25,\:x=-25[/tex]
[tex]5x^2-3125=0\\\\5x^2-3125+3125=0+3125\\\\5x^2=3125\\\\\frac{5x^2}{5}=\frac{3125}{5}\\\\x^2=625\\\\x=\sqrt{625},\:x=-\sqrt{625}\\\\x=25,\:x=-25[/tex]