There is no square root of -289 because it is an imaginary number but the square root of 289 is 17
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The square root of 289 is ± 17.
The positive square root of 289 is 17.
11.18033989 is the sq. root of 125.
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Sq root of 2 * sq root of 8 = 1.414 * 2.828 = 3.998792