PSAT Math Multiple-Choice Question 408: Answer and Explanation

Question: 408

Given that and , what is the product of f (-5) and g (-5)?

• A. -6
• B. -2
• C. 3
• D. 9

Correct Answer: D

Explanation:

D

Difficulty: Easy

Category: Function Notation

Getting to the Answer: Read carefully to see what the question is asking. You need to find the product (fg) of the results when you evaluate each function at x = -5. You could multiply the two functions together and then evaluate the result, but it's quicker to evaluate each function and then multiply:

Now, multiply to get (-9)(-1) = 9, which is (D).