+118724 $${\mathtt{2}}{\mathtt{\,\times\,}}{\mathtt{sqrt5}} = {\mathtt{2}}{\mathtt{\,\times\,}}{\sqrt{{\mathtt{5}}}}$$
The exact anser is just $$2\sqrt5$$ because this is an irrational number and cannot be simplified further.
You could however use a calculator to find an approximation.
approx= 4.472
+118724 $${\mathtt{2}}{\mathtt{\,\times\,}}{\mathtt{sqrt5}} = {\mathtt{2}}{\mathtt{\,\times\,}}{\sqrt{{\mathtt{5}}}}$$
The exact anser is just $$2\sqrt5$$ because this is an irrational number and cannot be simplified further.
You could however use a calculator to find an approximation.
approx= 4.472
