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quadratic equation in python.
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import math | |
import numpy as np | |
import matplotlib.pyplot as plt | |
a = int(input("please enter a: ")) | |
if a == 0: | |
print("a can't be 0.") | |
exit(1) | |
b = int(input("please enter b: ")) | |
c = int(input("please enter c: ")) | |
d = math.pow(b, 2) - (4 * a * c) | |
if d < 0: | |
print("delta is less than 0.") | |
exit(1) | |
x1 = (-b + np.sqrt(d)) / (2 * a) | |
x2 = (-b - np.sqrt(d)) / (2 * a) | |
print(f"root(s) are: \nx1: {x1}\nx2: {x2}") | |
x = np.linspace(-14, 14, 300) | |
y = a * (x ** 2) + b * x + c | |
plt.plot(x, y, label='f(x) = ax^2 + bx + c', color='blue') | |
plt.plot(x1, 0, 'ro', label=f'Root 1: {x1:.2f}') | |
plt.plot(x2, 0, 'go', label=f'Root 2: {x2:.2f}') | |
plt.get_current_fig_manager().set_window_title('quadratic function') | |
plt.title("quadratic function") | |
plt.xlabel("values of x") | |
plt.ylabel("values of y") | |
plt.axhline(0, color='gray', lw=0.5, ls='--') | |
plt.legend() | |
plt.grid() | |
plt.show() |
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