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
Correct Answer: Option D
Explanation
Let the number be x.
(sqrt{x} = 2k implies x = (2k)^2)
= (4k^2)
(frac{1}{2} times 4k^2 = 2k^2)