Square roots are + or - . So the best way to write this square root is ± 169.
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Yes, it is the square root of (-169)*(-169) = 28,561
The square root of 169 is 13
The square root of the number 169, is 13 because when 13 is multiplied by itself, it results to 169.
-13 or +13 are both square root of 169, but we often use the positive square root, 13, as the principal square root.
169