Resposta:
[tex] \frac{1}{x} - x + \sqrt{x} \\ \frac{1}{4} - 4 + \sqrt{4} \\ \frac{1}{4} - 4 + 2 \\ \frac{1}{4} - 2 \\ \frac{1 - 8}{4} \\ \frac{ - 7}{4} \\ - 1.75 \\ \\ [/tex]
