# 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) = 2x ^{2} + 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*) = 2*x*^{2} + 4. To find the value of *f*(4), just substitute 4 for *x*: *f*(4) = 2(4)^{2} + 4 = 32 + 4 = 36.