It is: 19
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(the square root of 19 - t)(t + the square root of 19)
19 squared is 361 but the square root of 19 is an irrational number and it is about 4.359 rounded to 3 decimal places
The square root of A2 is... A !
Any square root squared is the number inside the ()
The square root of 81 squared is 81.