PSAT Math Multiple-Choice Question 426: Answer and Explanation

Question: 426

A function is defined by the equation For what value of x does f(x) = 5?

• A. -5
• B. 2
• C. 9
• D. 30

Correct Answer: D

Explanation:

D

Difficulty: Medium

Category: Function Notation

Getting to the Answer: The question says that the value of f(x) = 5 and asks for the value of x that produces this result. This means you are solving for x, not substituting for x. Set the function equal to 5, and solve using inverse operations:

Thus, (D) is correct.