PSAT Math Multiple-Choice Question 434: Answer and Explanation

Question: 434

The complete graph of the function f(x) in the xy-plane is shown above. What is the domain of f(x)?

• A. All real numbers greater than -5
• B. All real numbers between and including -5 and 3
• C. All real numbers between and including -3 and 3
• D. All real numbers

Correct Answer: C

Explanation:

C

Difficulty: Medium

Category: Graphs of Functions

Getting to the Answer: The domain is all the x-values that will yield a value for f(x). From left to right, notice that the graph goes from -3 to 3 and includes the endpoints. Thus, (C) is correct.