(x-h)²=4a(y-k)

a = -2.8 (slider from -20 to 20, step 0.1)
h = 8.8 (slider from -20 to 20, step 0.1)
k = 8.4 (slider from -20 to 20, step 0.1)
c: (1.0 * 1.0 * 1.0 * 1.0 x - h)^(2.0) = 4.0 * a * (1.0 * 1.0 * 1.0 * 1.0 y - k)
S: (h, k)
texte1: "(x-" + h + ")²=4(" + a + ")" + "(y-" + k + ")"
C = Intersect(c, yAxis)
X_1 = Intersect(c, xAxis, 1.0)
X_2 = Intersect(c, xAxis, 2.0)