Factor $8=2^{2}\times 2$. Rewrite the square root of the product $\sqrt{2^{2}\times 2}$ as the product of square roots $\sqrt{2^{2}}\sqrt{2}$. Take the square root of $2^{2}$.
$$\frac{2\sqrt{2}}{7}+5$$
To add or subtract expressions, expand them to make their denominators the same. Multiply $5$ times $\frac{7}{7}$.
$$\frac{2\sqrt{2}}{7}+\frac{5\times 7}{7}$$
Since $\frac{2\sqrt{2}}{7}$ and $\frac{5\times 7}{7}$ have the same denominator, add them by adding their numerators.
