h(x) = f'(x) + g(x)

f(x) = x^(2.0) - 1.0
g(x) = -5.0 * x + 3.0
h(x) = x^(2.0) - 0.5 * x + 2.0
texte1: "f(x) =" + f
texte2: "g(x) =" + g