A method of extracting roots is to use the factorization of a number (by successively dividing out primes until the number is manageable)
factoring 324...
324=2*162=
2^2*81=2^2*9^2
so that 324 = (2*9)^2 = 18^2
therefore the square root of 324 is 18
±√324 = ±18
:)
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