Hi,
beim Integrieren gilt \(\int x^n = \frac{1}{n+1}x^{n+1}\).
Bei uns sei
$$f(x) = \frac{2}{\sqrt x} - 1 = 2x^{-\frac12} - 1$$
Also
$$F(x) = 2\cdot\frac{1}{-\frac12+1}x^{-\frac12+1} - x + c = 2\frac{1}{\frac12}x^{\frac12} - x + c$$
$$= 4x^{\frac{1}{2}} - x + c = 4\sqrt x - x + c$$
Alles klar?
Grüße