PSAT Math Multiple-Choice Question 431: Answer and Explanation

Question: 431

If and what is f (g(x))?

• A. x + 1
• B. 2x + 2
• C. 4x + 1
• D. 4x + 4

Correct Answer: A

Explanation:

A

Difficulty: Hard

Category: Function Notation

Getting to the Answer: To find f (g(x)), replace the variable in f(x) with g(x), or 2x - 1:

Thus, (A) is correct.