4.12 (2 decimal places.)
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the square root of 17 is not a perfect square, so it can't be reduced to a rational number. √17 ≈ 4.1231 but the decimal place keeps going on forever
the square root of 17 is 4.123105625617661
Rounded to two decimal places, the square root of 17 is 4.12.
There is no square root of -289 because it is an imaginary number but the square root of 289 is 17
It remains as 17