Implement the function findRoots to find the roots of the quadratic equation: ax2 + bx + c = 0.
The roots of the quadratic equation can be found with the following formula:
For example, the roots of the equation 2x2 + 10x + 8 = 0 are -1 and -4.
- Simple case: Exception
- Equal roots: Exception
- Distinct roots: Exception