Question

What is the square root of 1.8?

Answer 1

`(3*sqrt(5))/5`

Explanation:

1) Put it in fractions
`1.8 = 9/5`

2) Square root the fraction
`sqrt(9/5)`

3) Take out the perfect square
`3/sqrt(5)`

4) Rationalise
`3/sqrt(5)*sqrt(5)/sqrt(5) = (3*sqrt(5))/5`