[tex] \frac{2}{5} \times \sqrt{50} = \frac{2}{5} \times \sqrt{5 {}^{2} \times 2 } = \frac{2}{5} \times \sqrt{5 {}^{2} } \sqrt{2} = \frac{2}{5} \times 5 \sqrt{2} = 2 \sqrt{2} [/tex]
[tex] \frac{2}{5} \times \sqrt{50} = \frac{2}{5} + \times \sqrt{25 \times 2} = \frac{2}{5} \times 5 \sqrt{2} = \frac{2 \times 5 \sqrt{2} }{5} = 2 \sqrt{2} [/tex]
