The easiest way to compare two numbers with an inequality symbol is to first ensure that the numbers are written in the same format.
-sqrt(38),6
In this case, even though we do not know the exact value of -sqrt(38), we can say it is less than 0, because it is negative.
-sqrt(38)< 0 <6
⇓
-sqrt(38) < 6
Therefore, -sqrt(38) is less than 6.