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No. -18 is one of the square roots of +324. The other one is +18.
Negative 324 has no real square root. Neither has any other negative number.
-18 and +18
18
Yes - sqrt(324) = ±18.
The square roots of 324 are 18 and -18. 18 x 18 = 324. -18 x -18 = 324. You're Welcome :)
Gee, I don't know. Let's check it out. If it is, then 18 x 18 = 81 . 18 x 18 = 324 Nope. 18 x 18 is not 81, so 18 is not a square root of 81.