root 8 = root 4 x root 2 = 2 root 2, root 18 = root 9 x root 2 = 3 root 2;
2 root 2 x 3 root 2 = 6 x 2 = 12
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sqr root of 18 = 3 * square root of 2
20.7846097
That would be 18, the square root of 324.
it is 18 because when you put all the numbers back into the square root it becomes the square root of 18 and the square root of 18 squared would be 18
Do you want (square root of 18) * 47 = 199.4041123 or the square root of (18 * 47) = 29.0867914 ?