Question

How do you simplify `4 / sqrt 5`?

Answer 1

`4/sqrt(5) = 4/5sqrt(5)`
`color(white)("XXXXXXXX")` which some would consider a "simplification".

Explanation:

`4/sqrt(5) = 4/sqrt(5) * sqrt(5)/sqrt(5) = (4sqrt(5))/(sqrt(5)*sqrt(5)) = (4sqrt(5))/5`