Question 359578
Is it 18 times the sqrt? Or the 18th root?
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If it's the 18th root:
There's some ambiguity about the sign with problems like this.
If you first raise (-10)^18, you get a number.  Then there are 18 18th roots, the most obvious being -10 and +10.
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If you deal with the 18 being both the root and the exponent, then it's -10.