Call the number "n". Then, from the problem statement, n2 = 25 + n, or, in standard form, n2 - n - 25 = 0. Use the quadratic formula to find an exact answer with radicals. An approximate answer is 5.52437811. There is also a negative answer: - 4.52437811.
Check: 5.5249378112 = 30.52493782, which is reasonably close.
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