(10) public double smallerRoot() throws Exception
Depending on the equation ax^2 + bx + c = 0:
if no roots, throw exception
if single root, return it
if two roots, return the smaller root
if infinite root, return -Double.MAX_VALUE
(11) public double largerRoot() throws Exception
if no roots, throw exception
if single root, return it
if two roots, return the larger root
if infinite root, return Double.MAX_VALUE
(12) equals method
This should OVERRIDE equals method from Object class
return true...