x

f(2+x)

f(2-x)

a: 2
b: 1
f(x) = (x - a)^(2) + b
X = Point(xAxis)
x0: x(X)
s: x = x0
h = 1.5 (slider from 0 to 4)
X1: X + (h, 0)
X2: X + ((-h), 0)
x1: x(X1)
x2: x(X2)
Y1: (x1, f(x1))
Y2: (x2, f(x2))
i = Vector(X1, Y1)
j = Vector(X2, Y2)