Yes; do that....
The instructions are clear; all you need to do is do what it says. It's not our purpose here to do it for you.
One comment.... Since they ask you to calculate the first and second differences, your table of values needs to have consecutive values for x. Keep the values small -- maybe from -3 to +3 or something like that.
If you don't understand what they are asking you to do, here is an example using a similar equation.
y = x^2-3x-4
Table of values (using consecutive "small" values of x):
x y=x^2-3x-4
----------------
-2 4+6-4 = 6
-1 1+3-4 = 0
0 0+0-4 = -4
1 1-3-4 = -6
2 4-6-4 = -6
3 9-9-4 = -4
4 16-12-4= 0
5 25-15-4=6
First and second differences:
6 0 -4 -6 -6 -4 0 6 (the y values for the consecutive x values)
-6 -4 -2 0 +2 +4 +6 (first differences: differences between successive y values)
+2 +2 +2 +2 +2 +2 (second differences: differences between successive first differences)
Presumably one of the things you are supposed to learn from this is that, since the given equation is a polynomial of degree 2, the second differences are constant....