iran-konkur 2016 Q117

iran-konkur · Other · konkur-riazi_1395_specialized Composite & Inverse Functions Find or Apply an Inverse Function Formula
117. If $f(x) = \dfrac{1}{2}(x + \sqrt{x^2 + 4})$, then $f^{-1}(x) + f^{-1}\!\left(\dfrac{1}{x}\right)$ equals which of the following?
(4) zero (3) $x^2 - 1$ (2) $\dfrac{2}{x}$ (1) $2x$
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\textbf{117.} If $f(x) = \dfrac{1}{2}(x + \sqrt{x^2 + 4})$, then $f^{-1}(x) + f^{-1}\!\left(\dfrac{1}{x}\right)$ equals which of the following?

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(4) zero \hfill (3) $x^2 - 1$ \hfill (2) $\dfrac{2}{x}$ \hfill (1) $2x$



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