What is the square root of 20 in simplest form?

sqrt(20) =

sqrt( 5 x 4) =

sqrt(5 x 2 x 2) =

sqr(5) X sqrt(2) x sqrt(2)

NB The sqrt(2) X sqrt(2) = 2

Hence

sqrt(5) X 2

Ususally written as 2sqrt(5) = sqrt(20) .

NB It is written in this form ' 2sqrt(5) ' in order to indicate that the '2' is a coefficient of the sqrt(5) and NOT to be 'square rooted'.