since you can't get the square root of a negative number find when 6-x-x^2 < 0
It's a quadratic that you can solve. Plot it and see where the graph is above the x-axis. The domain is the possible x-values that give y-values greater than or equal to 0.
Find the domain of srt(6-x-x^2. Thank you!
2 answers
GanonTEK is correct. If you don't have ready access to a graphing utility, just use what you know about parabolas. Since this is one which opens downward, it is positive between the roots, where it crosses the x-axis.