18
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Yes - sqrt(324) = ±18.
-18 and +18
it is 18. you cannot simplify it because it is a perfect square and comes out evenly. You're Welcome :)
- (400^.5) = -(20) = -20 you just do the square root of the number, and attach the negative in front. and if you ever include the negative inside the square root, you'd have to deal with i, which is an imaginary number that signifies the square root of negative 1.