Source: Magoosh
k is a positive number. If k is twice its reciprocal, and j is twice k, then jk =
A. \(2\sqrt{2}\)
B. \(4\)
C. \(4\sqrt{2}\)
D. \(8\)
E. \(8\sqrt{2}\)
The OA is B
k is a positive number. If k is twice its reciprocal, and j is twice k, then jk =
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Solution:BTGmoderatorLU wrote: ↑Sun Apr 18, 2021 8:00 amSource: Magoosh
k is a positive number. If k is twice its reciprocal, and j is twice k, then jk =
A. \(2\sqrt{2}\)
B. \(4\)
C. \(4\sqrt{2}\)
D. \(8\)
E. \(8\sqrt{2}\)
The OA is B
If k is a positive number, then its reciprocal is 1/k. Let’s determine the value of k:
k = 2 * 1/k
k^2 = 2
k = ±√2
Since k is positive, k = √2. Since j is twice k, j = 2√2 and so jk = 2√2 * √2 = 4.
Answer: B
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