Let the equation of the circle, which touches x -axis at the point ( a, 0), a >0 and cuts off an intercept of length b on y -axis be x^2+y^2-α x+β…

Let the equation of the circle, which touches x -axis at the point $\displaystyle (\mathrm{a}, 0), \mathrm{a}>0$ and cuts off an intercept of length $\displaystyle b$ on $\displaystyle y$-axis be $\displaystyle x^2+y^2-\alpha x+\beta y+\gamma=0$. If the circle lies below $\displaystyle x$-axis, then the ordered pair $\displaystyle \left(2 \mathrm{a}, \mathrm{b}^2\right)$ is equal to