SAT Math Multiple Choice Question 10: Answer and Explanation

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Test Information

Question: 10

6. If 4x · n2 = 4x + 1 · n and x and n are both positive integers, what is the value of n ?

  • A. 2
  • B. 4
  • C. 6
  • D. 8

Correct Answer: B

Explanation:

B First simplify the equation 4xn2 = 4x+1n to 4xn = 4x+1, and then try an easy number for x. If x = 2, then 42n = 42+1. Since 16n = 43, then 16n = 64. So n = 4 The correct answer is (B).

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