Oh, dude, the square root of 81 is 9 because 9 times 9 is 81. And the square root of 169 is 13 because 13 times 13 is 169. It's like basic math, man.
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The square root of 169 = ± 13
169. 13 x 13 = 169. square root of 169 = 13.
√ -169 = 13i
The square root of 81 is 9 and the square root of 4 is 2!
Square root of 81