a) \(2x^3-50=0\Leftrightarrow2x^3=50\Leftrightarrow x^3=\dfrac{50}{2}=25\)
\(\Leftrightarrow x=\sqrt[3]{25}\) vậy \(x=\sqrt[3]{25}\)
b) \(25x^2-2=0\Leftrightarrow25x^2=2\Leftrightarrow x^2=\dfrac{2}{25}\)
\(\Leftrightarrow x=\pm\sqrt{\dfrac{2}{25}}=\pm\dfrac{\sqrt{2}}{5}\) vậy \(x=\dfrac{\sqrt{2}}{5};x=-\dfrac{\sqrt{2}}{5}\)