Simple
English UK

Quadratic Equation may be expressed as a product

`a(x-x1)(x-x2) = 0,`
where x1 and x2 are the solutions of equation, so called roots. After opening the brackets you receive well known form
`a*x**2 + b*x + c = 0.`
This is what you should do in this mission. You have input list with integers - a, x1 [, x2]. If it has length 2, it means, x1 == x2: equation has two equal roots (one distinct root). Your function should return quadratic equation as a string. Pay attention to specific cases. Use Quadratic Formula Calculator for recheck. Good luck!

Input: List with 2-3 integers.

Output: String.

Examples:

```assert quadr_equation([2, 4, 6]) == "2*x**2 - 20*x + 48 = 0"
assert quadr_equation([-2, 4, 6]) == "-2*x**2 + 20*x - 48 = 0"
assert quadr_equation([2, 4, -4]) == "2*x**2 - 32 = 0"
assert quadr_equation([2, 4, 0]) == "2*x**2 - 8*x = 0"
```

How it’s used: Practice of automatic representing human-friendly view of equations.

Preconditions:

• a != 0; abs(a) == 1 -> '[-]x**2'; a != abs(1) - > '[-]a*x**2'
• exactly one whitespace around signs: [-]a*x**2 sign b*x sign c = 0
• abs(b) == 1 -> [-]a*x**2 sign x sign c = 0
• keep correct view and spacing when x1=x2=0, x1 or x2 = 0, x1=-x2

Settings
Code:
Other:
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Hot keys:
•  to Run Code: to Check Solution: to Stop:
CheckiO Extensions

CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.

In order to install CheckiO client you'll need installed Python (version at least 3.8)

Install CheckiO Client first:

`pip3 install checkio_client`

`checkio --domain=py config --key=`

Sync solutions into your local folder

`checkio sync`

(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)

`checkio serv -d`

Alternatevly, you can install Chrome extension or FF addon

`checkio install-plugin`
`checkio install-plugin --ff`
`checkio install-plugin --chromium`

Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.

Pair Programming (Beta-version)

Welcome to Pair Programming! Engage in real-time collaboration on coding projects by starting a session and sharing the provided unique URL with friends or colleagues. This feature is perfect for joint project development, debugging, or learning new skills together. Simply click 'Start Session' to begin your collaborative coding journey!

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