The square roots are -13i and 13i where i is the imaginary square root of -1.
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The square root of 169 = ± 13
169. 13 x 13 = 169. square root of 169 = 13.
√ -169 = 13i
if p² = 169, then p = ±√169 In other words, take the square root of 169 and p is either the positive or negative value of the square root.
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.