SAT Math Multiple Choice Practice Question 472: Answer and Explanation

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Question: 472

13. Question below refers to the following definition.

For all real numbers x, let f(x) = 2x2 + 4.

What is the value of f(4)?

A. 16
B. 18
C. 20
D. 36
E. 72

Correct Answer: D

Explanation:

D According to the function, f(x) = 2x2 + 4. To find the value of f(4), just substitute 4 for x: f(4) = 2(4)2 + 4 = 32 + 4 = 36.

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