Solution:
Given:
[tex]\sqrt{225}[/tex][tex]\begin{gathered} Factor\text{ the number;} \\ \sqrt{225}=\pm\sqrt{15\times15}=\pm\sqrt{15^2} \\ \\ Applying\text{ the radical rule;} \\ \sqrt{a^2}=a,\text{ when }a\ge0 \\ Then, \\ \sqrt{15^2}=\pm15 \\ \\ Hence, \\ \sqrt{225}=\pm15=15\text{ OR }-15 \end{gathered}[/tex]Therefore, the square root of 225 is 15 or -15
