Express $\sqrt{19}\cdot\sqrt{19}$√19·√19 as a single radical, ie. in the form $\sqrt{n}$√n.
Simplify: $\left(\sqrt{45}\right)^2$(√45)2
Simplify: $\sqrt{5}\cdot\sqrt{5}$√5·√5
Simplify: $\sqrt{2}\cdot\sqrt{11}$√2·√11
Rewrite expressions involving radicals and rational exponents using the properties of exponents.