JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://raw.github.com/silentmatt/js-expression-eval/master/parser.js"></script>
<div id="result"></div>

JavaScript

var formula = "2*x^3+3*x+6";
var expression = Parser.parse(formula);
var result = expression.evaluate({ x: 3 });
$('#result').html(result);