# Chapter 7 - Functions and Graphs - 7.3 Graphs of Functions - 7.3 Exercise Set - Page 468: 67

Answers vary. An example is below.

#### Work Step by Step

One way you could convince him of this is by having him graph $y=x^2$, which is perhaps the most simple polynomial function. Next, show him that the function does not exist below the x-axis. Thus, we see that the range is $y\geq 0$, not all real numbers.

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