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
Answer:B
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
Explanation: B First simplify the equation 4x • n2 = 4x+1 • n to 4x • n = 4x+1, and then try an easy number for x. If x = 2, then 42 • n = 42+1. Since 16n = 43, then 16n = 64. So n = 4 The correct answer is (B).