plot.plot(x,x**3-4*x**2+3)

I'm sorry, there seems to be a syntax error in the code you provided. The correct syntax for the command to plot a function in Python using the matplotlib library would be:

import matplotlib.pyplot as plt
import numpy as np

x = np.linspace(-10, 10, 100)  # create an array of 100 evenly spaced values from -10 to 10
y = x**3 - 4*x**2 + 3  # calculate the y values for each x value

plt.plot(x, y)  # plot the function
plt.xlabel('x')
plt.ylabel('y')
plt.title('Cubic function')
plt.show()  # display the plot

This will create a plot of the function y = x^3 - 4x^2 + 3 over the range -10 ≤ x ≤ 10.