exam Maths Puzzle Numerical Ability

Im thinking of a number
when i subtract 25 from the number the square it the answer
i get is the same as
when i square the number the subtract 25 from the answer

what is my number?

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exam Other Question
Explain the relevance and application of exponential functions in real-life situations. please help me solve this problem it says to simplify a. 3 radical 54 and b says radical 25x^2y^3