18² is the same as 18 x 18, which equals 324.
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√182 is 18. Trouble is, that's not 18 squared. Try √3242 * * * * * Good try but not good enough! 18 squared is the squared root of 18 to the fourth power. That is to say, 324 is the square root of 104,976
Seems to us that any value at all can be squared.
b= 10
18 x 18 = 324
20 squared is 20 x 20 or 400.