Quadratic Equation Solver
A quadratic equation is a polynomial equation of the 2nd degree. It's basic form is this:
ax^{2} + bx + c = (x  x_{1})(x  x_{2})
And the solutions are calculated: x_{1/2} =  − b ± √ b2  4ac  2a 
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There are few more things you should know. The expression under the square root is called the discriminant: D = b2  4ac
There are 3 possible cases:  If D > 0, both roots are real numbers.
 If D = 0, then there is exactly one root, aka called a double root
 If D < 0, (nonreal) complex conjugates roots
