\(\sqrt{0}=0\)

\(\sqrt{25}=5\)

\(\sqrt{64}=8\)

\(\sqrt{25}-\sqrt{49}=5-7=-2\)

\(6\sqrt{4}-12\sqrt{81}=6⋅2-12⋅9=-96\)

\(\sqrt{4}⋅\sqrt{36}=2⋅6=12\)

\(\sqrt{7^2+51}=\sqrt{49+51}=\sqrt{100}=10\)

\(-\sqrt{81}=-9\)

\(\sqrt{-25}\) kan niet.

\(\sqrt{9^2}=9\)

\(\sqrt{(-8)^2}=\sqrt{64}=8\)

\((6\sqrt{8})^2=6^2⋅\sqrt{8}^2=36⋅8=288\text{.}\)

\({6\sqrt{2} \over 7}=\frac{6}{7}\sqrt{2}\text{.}\)

\((6\sqrt{3}-2)(6\sqrt{3}+2)=(6\sqrt{3})^2-2^2=36⋅3-4=108-4=104\text{.}\)