import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(-2, 2, 400)
y1 = -x2
y2 = -x2 + 1
y3 = -(x + 1)**2

plt.plot(x, y1, label='y = -x^2')
plt.plot(x, y2, label='y = -x^2 + 1')
plt.plot(x, y3, label='y = -(x+1)^2')

plt.xlabel('x')
plt.ylabel('y')
plt.legend()
plt.grid(True)
plt.show()