You are looking for the square root of 225 which is 15.
(15x15=225)
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If you mean: n^2 -13n +42 then it equals (n -6)(n -7) when factored
n x n2 = n3
n2 + 9n + 18 = (n + 6)(n + 3)
If: n2 = 19 Then: n = the square root of 19.
n2 = 20 + n so n2 - n - 20 = 0 that is (n - 5)(n + 4) = 0 so that n - 5 = 0 or n + 4 = 0 n = 5 or n = -4