f(x) = a ln(b x + c) + d

a = 1 (slider from -5 to 5, step 0.1)
b = 1 (slider from -5 to 5, step 0.1)
c = 0 (slider from -5 to 5, step 0.1)
d = 0 (slider from -5 to 5, step 0.1)
f(x) = a log(b x + c) + d
text2: "f(x) = " + f
g(x) = log(x)
P_1 = Point(g)
P_2 = Point(f)