(y - b)^2 = 2p(x - a)

a = 0 (slider from -5 to 5, step 0.1)
b = 0 (slider from -5 to 5, step 0.1)
p = 2 (slider from -5 to 5, step 0.1)
c: (y - b)^(2.0) = 2.0 * p * (x - a)
tekst1: "(y - " + b + ")^2 = 2 * " + p + "* (x - " + a + ")"
F: (0.5 * p + a, b)
d: x = -(0.5 * p) + a