SAT Math Multiple Choice Practice Question 2: Answer and Explanation

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Question: 2

2. If f(x) = 2x4, then f(-2) =

A. -256
B. -32
C. 0
D. 32
E. 256

Correct Answer: D

Explanation:

D. Plugging in the number gives you 2(-2)4. Remembering the acronym PEMDAS (see Chapter 12 if you don't remember), you know to do the exponent first: (-2)4 = (-2)(-2)(-2)(-2) = +16; 2(16) = 32.

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