Question

How do you simplify: the square root of -169?

Answer 1

You may start by observing that `169=13^2`

Explanation:

But this doesn't help much as square roots of negative numbers are not defined.
You may find a way out by saying:

`sqrt(-169)=sqrt((-1)xx(169))=sqrt(-1)*sqrt(169)=sqrt(-1)*sqrt(13^2)=i*13=13i`