If sqrt(x) is an integer, what is the value of sqrt(x)
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Am leaning towards choice C, as in A we can get sqrt(x) as 4 and -4. Only with B we can confirm that the sqrt(x) is 4. However OA is A
sqrt (x) means positive square root of x. So though the square roots of 16 are 4 and -4, sqrt(16)=4 not -4. Your difficulty probably lies in this distinction