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Python Math: Find the roots of a quadratic function

Python Math: Exercise-30 with Solution

Write a Python program to find the roots of a quadratic function.

Sample Solution:-

Python Code:

from math import sqrt

print("Quadratic function : (a * x^2) + b*x + c")
a = float(input("a: "))
b = float(input("b: "))
c = float(input("c: "))

r = b**2 - 4*a*c

if r > 0:
    num_roots = 2
    x1 = (((-b) + sqrt(r))/(2*a))     
    x2 = (((-b) - sqrt(r))/(2*a))
    print("There are 2 roots: %f and %f" % (x1, x2))
elif r == 0:
    num_roots = 1
    x = (-b) / 2*a
    print("There is one root: ", x)
else:
    num_roots = 0
    print("No roots, discriminant < 0.")
    exit()
	

Sample Output:

Quadratic function : (a * x^2) + b*x + c                                                                      
a: 5                                                                                                          
b: 20                                                                                                         
c: 10                                                                                                         
There are 2 roots: -0.585786 and -3.414214

Flowchart:

Flowchart: Find the roots of a quadratic function

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Python: Tips of the Day

Getting rid of unwanted characters:

You can get rid of whitespaces or any specific character using strip methods in Python. You can use either plain strip for both sides, lstrip for the left side and rstrip for the right side only.

str="+++Welcome python+++"
str.strip()

print(str)

Output:

+++Welcome python+++