Question

How do you simplify 3 times square root of 5 minus square root of 20?

Answer 1

`\sqrt5`

Explanation:

Given that

`3\sqrt5-\sqrt20`

`=3\sqrt5-\sqrt{4\cdot 5}`

`=3\sqrt5-\sqrt4\sqrt5`

`=3\sqrt5-2\sqrt5`

`=\sqrt5`