Find Quadratic Roots Challenge

quadratic-equation.php

<?php
/**
 * @return array An array of two elements containing roots in any order
 * @link https://www.testdome.com/questions/php/quadratic-equation/38497
 */
function findRoots($a, $b, $c)
{
    return [
        (-$b + sqrt(pow($b, 2) - ((4 * $a) * $c))) / (2 * $a),
        (-$b - sqrt(pow($b, 2) - ((4 * $a) * $c))) / (2 * $a),
    ];
}

// Array
// (
//    [0] => -1
//    [1] => -4
// )
print_r(findRoots(2, 10, 8));