Mathematics

Mathematics

Problem

If f:[1,∞)→[2,∞)f: [1, \infty) \to [2, \infty) is given by f(x)=x+1xf(x) = x + \frac{1}{x}, then f−1(x)f^{-1}(x) equals a. x+x2−42\frac{x + \sqrt{x^2 - 4}}{2} b. x1+x2\frac{x}{1+x^2} c. x−x2−42\frac{x - \sqrt{x^2 - 4}}{2} d. 1+x2−41 + \sqrt{x^2 - 4}

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