Expressed as a surd, sqrt(800) = 20 sqrt(2).
Expressed as a decimal, rounded to two decimal places, sqrt(800) = ±28.28.
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The square root of 640000 is 800. This is because the square root of a number is a value that, when multiplied by itself, gives the original number. In this case, 800 multiplied by 800 equals 640000.
20 times the square root of 2
There is two ways to interpret "5 radical sign'. It can either mean: five times the square root of 800 leading to: √(5 × √800) ≈ 11.8921 or, if the five is small and raised slightly it is the fifth root of 800 and it leads to: √(fifth_root(800)) = (800^(1/5))^(1/2) = 800^(1/10) ≈ 1.9512
The square root of 900 is equal to 30 the square root of 800 is equal to 20√2, or about 28.28 The number you want would lie somewhere between those two values. If you're looking for a whole number, then 29 meets that condition.
The principal square root is the non-negative square root.