sqrt[27*3] = sqrt[(9*3)*3] = sqrt[9*(3*3)] = sqrt[9*9] = sqrt[92] = 9
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27x3 normally means 27 times 3 (which is 81) with a square root of 9. If you mean x to represent a missing number or group of numbers, then you have things like 271593 and there is no straightforward general formula for the square root of things like that.
There are infinitely many of them. They include square root of (4.41) square root of (4.42) square root of (4.43) square root of (4.44) square root of (4.45) square root of (5.3) square root of (5.762) square root of (6) square root of (6.1) square root of (6.2)
A principal square root is any square root that's answer is positive, and a perfect square root is a square root that's answer is an integer.
square root of 20 = square root of 4 * square root of 5. square root of 4 = 2, so your answer is 2 square root of 5.
Square root (24) - square root (6) = 2.44948974