It is an irrational number and it is about 8.660254038
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a negative multiplied by a negate is a positive a positive multiplied by a positive is a postivive therefore the square root of 9 can be + or - 3
15.556 to three decimal places
the square root of a number is the number that is multiplied by itself to get that number, for example the square root of 9 is 3
√8 multiplied by 3√2 = 3.563594873 (when rounded)
sqrt(3)sqrt(25) = 5*sqrt(3)