Answer:
D. {5.9,3.781}
Explanation:
The equation of the function is given as;

You can use a graph tool to graph and view the graph;
From the graph attached, the point that gives a correct approximation of the function is : {5.9,3.781}
Using this in the equation, to test the coordinates will give;
3.781= 8-√{2*5.9 +6}
3.781 = 8 -√17.8
3.781 = 8-4.219
3.781 = 3.7809