ForHosting KIT · Developer Utilities

Vieta's formulas calculator

Vieta's formulas connect the coefficients of a univariate polynomial to the elementary symmetric sums of its roots without ever computing those roots one by one.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

Given a dense list of finite coefficients in ascending powers—constant term first, highest degree last—this calculator returns the sum of all roots and the product of all roots for the equation a0 plus a1 x plus dots plus an x to the n equals zero, provided the leading coefficient an is nonzero. The classical identities are sum equals negative a sub n minus one over an, and product equals negative one to the n times a0 over an. That closed form is exact over the complex numbers for any degree at least one, works for monic and non-monic polynomials alike, and stays deterministic: no random seeds, no network calls, and no model drift. Invalid input such as a zero leading coefficient is rejected with a clear validation error instead of a silently wrong degree. The free browser tool and the paid API share one pure function, so homework demos, contest fixtures, and automated pipelines never diverge on the same coefficient vector.

How to use it

Enter your values in the form above. The tool checks them before calculating and shows the result on the same page.

Check your inputs

Use the labels and units shown next to each field. If something is missing or outside the allowed range, the page points to the field to fix.

Use it again or automate it

Use the browser tool for individual checks and the API when you need the same capability in an automated workflow.

What you can do with it

Get an answer now

Enter one set of values and see the result without building a spreadsheet or script.

Compare scenarios

Change one value at a time and rerun the calculation to understand what affects the result.

Automate repeated work

Use the API when the same calculation needs to run inside your product or workflow.

FAQ

How do I use this capability?

Complete the fields above and run it on this page. The form highlights anything that needs attention.

For developers — API access

Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.

API endpoint

POSThttps://api.kit.forhosting.com/algebra/vieta-formulas

Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.

Call it from your stack

curl -X POST https://api.kit.forhosting.com/algebra/vieta-formulas \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"coefficients":[2,-3,1]}'

const res = await fetch("https://api.kit.forhosting.com/algebra/vieta-formulas", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "coefficients": [
      2,
      -3,
      1
    ]
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/algebra/vieta-formulas",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "coefficients": [
        2,
        -3,
        1
    ]
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/algebra/vieta-formulas", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"coefficients":[2,-3,1]}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"coefficients":[2,-3,1]}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/algebra/vieta-formulas", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "coefficients": [
    2,
    -3,
    1
  ]
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "algebra.vieta_formulas",
  "status": "queued",
  "_links": {
    "result": "/tasks/tsk_…/result"
  }
}

The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.

Pricing

Per request$0.002

Published price — no tokens, no invented credits. A failed task is never charged.

Errors

HTTP	Code	Meaning
`401`	`unauthorized`	Missing or invalid API key.
`402`	`insufficient_balance`	Your balance doesn't cover the task price.
`404`	`unknown_type`	That task type doesn't exist.
`429`	`rate_limited`	Too many requests. Use the webhook instead of polling.

Read the full KIT documentation →

Run — free