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A square number is a number which can be expressed as n x n where n are integers.
The formula can be written, with "n" representing a number or value, as n2 or n X n.
A number times itslef (n^2, or n x n). Sources I am an algebra 2 student.
x^2 - 0.09 is an integer if x = sqrt(n + 0.09) where n is any integer. And, in that case, the perfect square is n^2.
call sqrtx n, then n + 5 = 5 - n, ie 2n = 0, so there's no solution other than the trivial 0.