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Simplify does not mean find a decimal approximation. Simplifying an expression with a square root means reduce the square root, if possible. Reducing a square root is done by finding perfect square factors, if any, of the radicand (the expression within the radical). So we are looking for perfect square factors of 1000. I hope it is easy to see that 100 is a perfect square and it is a factor of 1000:
Next we use a property of radicals, , to separate the perfect square factor into its own square root:
The square root of 100 is 10 so now we have:
or
There are no other perfect square factors of 10 (other than 1) so this simplified version of . (BTW, the decimal approximation for this is 94.8683298050513800)