Practice!

Sample Problem

Identify the domain and range of the following function

y = 2√x

A)Domain: -∞< x <∞

     Range: -∞< y <∞

 B)Domain: 0 ≤ x <∞

     Range: 0 ≤ y <∞

C) Domain: 0 ≤ x <∞

     Range: -∞< y <∞

D)Domain: -∞< x <∞

     Range: 0 ≤ y <∞

Solution

Graph:

Based on the graph, we can see that the domain and range are both all real positive numbers,

So choice B is correct