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The square root of 169 = ± 13
13, is not the square root of 156, but the best i can give you is that 13 is the square root of 169 and 14 is the square root of 196.
169. 13 x 13 = 169. square root of 169 = 13.
If the square root of a number is irrational, it is its own conjugate. sqrt(13)*sqrt(13) = 13 and you no longer have an irrational!
To do square root in excel you type SQRT and then whatever number you want to square root in brackets. For instance, if you want the square root of 13 in one cell, you would type =SQRT(13).