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$f(x + \sqrt x ) = x - \sqrt x $

$f(380) = ?$

Substituting 361 in place of x,

$f(361 + \sqrt {361} ) = 361 - \sqrt {361} $

$ \Rightarrow f(361 + 19) = 361 - 19$

$ \Rightarrow f(380) = 342$

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