Question

How do you simplify `sqrt125-sqrt20`?

Answer 1

`sqrt(125)-sqrt(20) = 3sqrt(5)`

Explanation:

`sqrt(125) = sqrt(5^2*5) = 5sqrt(5)`
`sqrt(20) = sqrt(2^2*5) = 2sqrt(5)`

`sqrt(25)-sqrt(20`
`color(white)("XXX")=5sqrt(5)-2sqrt(5)`
`color(white)("XXX")=3sqrt(5)`