[Problem of the day][数学挑战][Algebra][代数][4] Mathematics Algebra

casperyc 2020-5-4 294

Given $$ \huge \sqrt{x^2 + 25} - \sqrt{x^2 - 15} = 4. $$ What is the value of $$ \huge \sqrt{x^2 + 25} + \sqrt{x^2 - 15} = ?$$

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