The square root of a number is 2k. What is half of the number
A
\(\sqrt{\frac{k}{2}}\)
B
\(\sqrt{k}\)
C
\(\frac{1}{2}k^2\)
D
2k2
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
Let the number be x.
\(\sqrt{x} = 2k \implies x = (2k)^2\)
= \(4k^2\)
\(\frac{1}{2} \times 4k^2 = 2k^2\)
Source: Myschool Past Questions Archive (Record #26604)