a$)$ Write a user$-$defined function that finds roots of a quadratic equation, $a{x}^2+bx+c=0$ using the following formula:

$x=\frac{-b+-\sqrt[\phantom{2}]{b^2-4ac}}{2a}$

name of the function is "QuadRoots" and Function accepts coefficients of the quadratic equation as inputs. $(5$pts$)$