Integral (akarX -2) (2 akarX+1) dx

[tex] \int\limits { (\sqrt{x} - 2})(2 \sqrt{x} + 1) \, dx \\ = \int\limits (2x - 3 \sqrt{x} - 2) \, dx \\ = x^2 - 2x \sqrt{x} - 2x + c[/tex]