Question 769484
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