Question

How do you simplify `sqrt20 * sqrt45`?

Answer 1

30

Explanation:

`sqrt(20)=sqrt(4)*sqrt(5)=2sqrt(5)`

`sqrt(45)=sqrt(5)*sqrt(9)=3sqrt(5)`

so

`sqrt(20)*sqrt(45)=2sqrt(5)*3sqrt(5)=6sqrt(25)=6*5=30`