Integer, eh?
Number Theory
Level
4
X is an integer and 9 < x^2 < 99
Max value of X - Min value of X = ??
13
18
0
5
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Don't forget the negative values too. The largest has to be 9 which is 81 but the smallest is -9 which also squares to 81. Therefore, 9 - (-9) = 9+9 = 18