import matplotlib.pyplot as plt
import numpy as np

X = np.arange(-1.0, 1.0, 0.025)

a = 9
b = 6
c = 8

Y = (a-4)*(X**2) + (b-5)*X + (c-6)

G = np.exp(X)/(np.exp(X) + 1)

plt.plot(X,Y, 'g', label="F(x) = 5x^2 + x + 2")
plt.plot(X,G, 'y', label="G(x) = e^x/(e^x+1)")
plt.legend(loc="upper left")

plt.show()