(-infinity, infinity)
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The domain of y = 2x is [0, +infinity].
3
x = 2
The domain is (-infinity, infinity) The range is (-3, infinity) and the asymptote is y = -3
Any number raised to the power of zero equals 1. For example, start out with 2^3 = 8. Then divide by 2 and get 2^2=4. Divide by 2 again: 2^1=2. Divide by two again: 2^0=1.