6
8
12
24
x+2
x+4
x-2
2(x+2)
2
4
-6
-8
+-9
+-7
+-5
+-3
0,2
1,1
-1,3
-3,4
{ x(x+1)(2x+1)}/6
x(x+1)/2
x
{x(x+1)/2}^2
1
5
10
(0,0)
(4,-3)
(-4,3)
(10,10)
36
37
39
40
20m^2
210m^2
290m^2
300m^2