Question

How do you rewrite in simple radical form: `sqrt 20`?

Answer 1

`sqrt(20) = 2sqrt(5)`

Explanation:

If `a, b >= 0` then:

`sqrt(ab) = sqrt(a)sqrt(b)`

Also if `a >= 0` then:

`sqrt(a^2) = a`

So we find:

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