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

##### 1 Answer

Jun 17, 2016

#### Answer:

#### Explanation:

Multiply the bracket out to give

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

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.