k = 1 (slider from -5 to 5, step 0.01)
f(x) = x^(2)
A = Point(f)
q: 1 / 2^(k)
E1 = (-4.32, -2.62)
E3 = (7.3, 6.32)
sx: x(E3 - E1) / 2
sy: y(E3 - E1) / 2