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A Perfect Square Always Ends in 0,1,4,5,6,9 as Last Digit

If x2 = k, ...

Question

If $x^{2} = k$ , where $x$ and $k$ are integers, which of the following could be the value of $k$ ?

3

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9

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Solution

The correct option is C $9$
Given $x$ and $k$ are integers and $x^{2} = k$ .
Therefore $k$ must be a perfect square.
Among given options $9 = 3^{2}$ is a perfect square.
So $k = 9$ .

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