Question on: WAEC Mathematics - 2003
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
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Correct Option: D
Let the number be x.
\(\sqrt{x} = 2k \implies x = (2k)^2\)
= \(4k^2\)
\(\frac{1}{2} \times 4k^2 = 2k^2\)
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