-3√5 - √6 - √5 =

-11.39376165278233688383397874963099633372842091910277302551

what ? can you explain this please ?

To simplify the expression -3√5 - √6 - √5, you can combine like terms.

The terms √5 and -√5 cancel each other out, as they have opposite signs and equal magnitudes. Similarly, we cannot combine -√6 with any other term as there are no like terms.

Therefore, the simplified expression becomes -3√5 - √6 - √5.

And that is the final answer.