How do you find the domain and range of y=2^(-x) y=2x?

1 Answer
Dec 16, 2017

Domain: x in RR
Range: {y|0<=y}

Explanation:

The function is defined for all real numbers, so the domain is:
{x inRR}

Since the value of any exponential with a positive base can never be 0, and the function goes to positive infinity, we can using the fact that it is continuous on this interval conclude that the range must be:
{y|0<=y}