A'

f(x) = sqrt(x)
b = 3 (slider from -3 to 3, step 0.1)
g(x) = f(b * x)
A = Point(f)
A'_1 = Intersect(g, d, (2.999999999999999, 2.9999999999999996))
A' = Intersect(g, d, (-89.99999999998073, 2.999999999999679))