lean_workbook_plus_10623

basically we want x>point of equality, since after the point of equality, the difference between 2x and sqrtx grow exponentially (2x is always bigger after point of equality). the 2 points of equality of $\sqrt{x}=2x$ are $\frac{1}{4}$ and 0. so we take x>the larger of the 2, or $x>\frac{1}{4}$