x y=2*(0.5)^x
-10 2048
-9 1024
-8 512
-7 256
-6 128
-5 64
-4 32
-3 16
-2 8
-1 4
0 2
1 1
2 0.5
3 0.25
4 0.125
5 0.0625
6 0.03125
7 0.015625
8 0.0078125
9 0.00390625
10 0.00195313
As x goes to negative infinity the function grows to infinity.
As x grows to infinity the function decreases an approximate to zero.