這個題目是說，給出了一個一元二次方程的兩個整數根，根據根去算每個根前面的係數，等等一個整數的係數資訊，讓方程式成立。

在考初中知識，老大叔已經忘了一元二次方程式的解公式，表示很無奈的只能去問度娘。

找到的是韋氏公式，資訊如下：

根與係數之間的關係又稱韋達定理,指的是如果方程ax平方+bx+c=0(a不等於0)的兩根為x1、x2,那麼x1+x2=-b/a,x1x2=c/a

因為已經設定了根是整數，所以a 直接設定為1就好了。因為x1+x2=-b/a 是整數，-b/a 就一定是整數。

根據韋氏公式計算出來b 和c的值就可以了。

def quadratic(x1, x2):
    a=1
    b=0-(x1+x2)
    c
 
=x1*x2
    return(a,b,c)

原題目：

In this Kata you are expected to find the coefficients of quadratic equation of the given two roots (x1andx2).

Equation will be the form ofax^2 + bx + c = 0

Return typeis 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 fixa = 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 becomesx^2 - 3x + 2 = 0

Example 2

quadratic(0,1) = (1, -1, 0)

This means(x-0) * (x-1) = 0

Notes

• Inputs will be integers.
• Whenx1 == x2, this means the root has the multiplicity of two