Calculate: 4 (sqrt() 5+3)

Expression: $$4 ( \sqrt { 5 + 3 ) }$$

Add $5$ and $3$ to get $8$.

$$4\sqrt{8}$$

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 $2^{2}$.

$$4\times 2\sqrt{2}$$

Multiply $4$ and $2$ to get $8$.

$$8\sqrt{2}$$