b) \( f: g \) \( \begin{array}{ll}\text { c) } f: g \\ \text { 13. Dadas las funciones } f(x)=\frac{x^{2}+1}{x}, g(x)=\sqrt{x+2}, h(x)=\frac{-1}{x^{2}} \text {, calcula: } \\ \begin{array}{ll}\text { a) }(f \circ g)(x) & \text { c) }(g \circ h)(1)\end{array}\end{array} \)
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Para calcular \( (f \circ g)(x) \), primero evaluamos \( g(x) = \sqrt{x + 2} \) y luego sustituimos este resultado en \( f(x) = \frac{x^2 + 1}{x} \). Así que tenemos: \[ (f \circ g)(x) = f(g(x)) = f(\sqrt{x + 2}) = \frac{(\sqrt{x + 2})^2 + 1}{\sqrt{x + 2}} = \frac{x + 2 + 1}{\sqrt{x + 2}} = \frac{x + 3}{\sqrt{x + 2}}. \] Para el cálculo de \( (g \circ h)(1) \), primero evaluamos \( h(1) = \frac{-1}{1^2} = -1 \), y luego encontramos \( g(-1) \): \[ g(-1) = \sqrt{-1 + 2} = \sqrt{1} = 1. \] Por lo tanto, \( (g \circ h)(1) = 1 \).