Question

How do you simplify `sqrt3(-3sqrt7)`?

Answer 1

`-3sqrt21`

Explanation:

Multiply the bracket out to give `-3 xx sqrt3 xx sqrt7`

If roots are being multiplied, they can be combined into one.

`-3sqrt21`

But I would not say that this is any simpler. 21 has no factors which are squares, so this is as far as we could go without using a calculator.