---
id: 5900f4d01000cf542c50ffe3
challengeType: 5
title: 'Problem 356: Largest roots of cubic polynomials'
forumTopicId: 302016
---
## Description
Let an be the largest real root of a polynomial g(x) = x3 - 2n·x2 + n.
For example, a2 = 3.86619826...
Find the last eight digits of.
Note: represents the floor function.
## Instructions
## Tests
```yml
tests:
- text: euler356() should return 28010159.
testString: assert.strictEqual(euler356(), 28010159);
```
## Challenge Seed
```js
function euler356() {
return true;
}
euler356();
```