SAT Math Multiple Choice Practice Question 485: Answer and Explanation

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Question: 485

5. If f(3) = 6 and f(4) = 13, then which of the following could be f(x) ?

A. x + 3
B. 2x
C. 3x + 1
D. x2 – 2
E. x2 – 3

Correct Answer: E

Explanation:

E Plug 3 into each answer choice, and try to get 6. Eliminate C and D. Now plug 4 into each remaining answer choice, and try to get 13. Eliminate A and B.

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