f(x) = (x^(2) + 2 * x) / (2 * x + 4) - (x^(2) - 9) / (x + 3)
B = Point(xAxis)
a = OrthogonalLine(B, xAxis)
C = Intersect(f, a)
b = Segment(B, C)
teksti1: "f(x) =" + (LaTeX[f]) + "  \; = -\frac{1}{2}x + 3"