a = 1 (slider from -5 to 5, step 0.1)
b = 1 (slider from -5 to 5, step 0.1)
c = -1 (slider from -5 to 5, step 0.1)
f(x) = a * x^(2) + b * x + c
V = Extremum(f)
g = CompleteSquare(f)
f' = Simplify(f)
A, B = Root(f)