Question

Question #c2eb1

Answer 1

It doesn't simplify nicely.

Explanation:

You could call `-sqrt(42)-sqrt(42)`
`-2sqrt(42)` if you wanted, the same as calling `-x-x`
negative `-2x`.
Then, if you think of `2` as `sqrt(4)`, then you could call it `-sqrt(4)sqrt(42)`
Using the rule `sqrt(a)sqrt(b)=sqrt(a*b)`, you end up with `-sqrt(168)`. However, that doesn't simplify nicely, so that's about as far as you can go without getting a nasty decimal number (-12.9614814).
In fact, you probably would want to leave it as `-2sqrt(42)`, since that is the simplest radical possible.