IslandT: Find the coefficients of the Quadratic Equation of the given two roots with Python

In this example, you are expected to find the coefficients of the quadratic equation of the given two roots (x1 and x2) with a python function.

The Quadratic Equation looks like this ax^2 + bx + c = 0. Our mission is to find the coefficients of the equations which is a, b, and c. The return type from the function is a Vector containing coefficients of the equations in the order (a, b, c). Since there are infinitely many solutions to this problem, we fix a = 1.

Below is the method to find the return Vector.

quadratic(1,2) = (1, -3, 2)

This means (x-1) * (x-2) = 0; when we do the multiplication this becomes x^2 – 3x + 2 = 0.

def quadratic(x1, x2):
    a = 1
    b= a * -x2 + a * -x1
    c = -x1 * -x2
    return (a, b, c)

A very simple solution, we can also find the Vector even if a has a different value than one by creating another method with an extra ‘a’ parameter in the input.

quadratic(a, x1, x2)

This question is from CodeWars, which is a great place to learn how to code for free, besides Python, there are tons of other programming languages for you to select include Java and C#.

from Planet Python
via read more