SAT Math Multiple Choice Question 544: Answer And Explanation

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SAT Math Multiple-Choice Tests

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• SAT Math Multiple-Choice Test 25

Question: 544

4. The function f(x) is defined as f(x) = -3g(x), where g(x) = x + 2. What is the value of f(5)?

• A. –21
• B. –1
• C. 4
• D. 7

Correct Answer: A

Explanation:

A

Difficulty: Easy

Category: Passport to Advanced Math / Functions

Strategic Advice: Understanding function notation will earn you valuable points on Test Day. When you see an expression like f(x), it means to substitute the given value for x in the function's equation. When there is more than one function involved, pay careful attention to which function should be evaluated first.

Getting to the Answer: You are looking for the value of f(x) at x = 5. Because f(x) is defined in terms of g(x), evaluate g(5) first by substituting 5 for x in the expression x + 2.

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