In this Kata you are expected to find the coefficients of quadratic equation of the given two roots (`x1` and `x2`).
Equation will be the form of ```ax^2 + bx + c = 0```
Return type is a Vector (tuple in Rust, Array in Ruby) containing coefficients of the equations in the order `(a, b, c)`.
Since there are infinitely many solutions to this problem, we fix `a = 1`.
Remember, the roots can be written like `(x-x1) * (x-x2) = 0`
### Example 
    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`
### Example 2
    quadratic(0,1) = (1, -1, 0)
This means `(x-0) * (x-1) = 0`; when we do the multiplication this becomes `x^2 - x + 0 = 0`
### Notes
* Inputs will be integers.
* When `x1 == x2`, this means the root has the multiplicity of two
def quadratic(x1, x2):
    coef = ()
    a = 1
    b = -(x1 + x2)
    c = -x1 * -x2 
    
    coef = (a, b, c)
    return coef

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