Mathematics - Circle Question with Solution | TestHub

If the lengths of external and internal common tangents to two circles $x^2+y^2+14x-4y+28=0$ and $x^2+y^2-14x+4y-28=0$ are $\lambda$ and $\mu$. Then the value of $\left[\frac{\lambda +\mu }{4}\right]$ is equal to (where [.] denotes greatest integer function)