help!! I don't know what to do with the square root

Answer:
[tex]\sqrt{10}[/tex]
Step-by-step explanation:
[tex]g(4) = \sqrt{(4)^2 - (4) - 2} \\\\g(4) = \sqrt{16 - 4 - 2} \\\\g(4) = \sqrt{16 - 6} \\\\g(4) = \sqrt{10}[/tex]
You can't simplify this anymore
Hope this helps! : )