Quadratic Equation Solver

A quadratic equation is a polynomial equation of the 2nd degree. It's basic form is this:

ax² + bx + c = (x - x₁)(x - x₂)

And the solutions are calculated:

x1/2 =	− 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:

1. If D > 0, both roots are real numbers.
2. If D = 0, then there is exactly one root, aka called a double root
3. If D < 0, (non-real) complex conjugates roots

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