x = 13
Here, we want to solve the equation;
[tex]\begin{gathered} \sqrt[]{x\text{ + 3}}\text{ = 4} \\ \\ we\text{ square both sides} \\ \\ (\sqrt[]{x\text{ + 3}})^2=4^2 \\ \\ x\text{ + 3 = 16} \\ \\ x\text{ = 16-3} \\ \\ x\text{ = 13} \end{gathered}[/tex]
