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Question

If x2+k=G and x is an integer, which of the following could be the value of G−k?

A
7
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B
8
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C
9
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D
10
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E
11
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Solution

The correct option is D 9
x2+k=G
x2=Gk
Because you know that x is an integer, x2 is a perfect square (the square of an integer). Therefore, Gk is also perfect square. The only perfect square among the answer choices is (C), 9

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