Parent controller for calling function from another controller

ParentController.php

<?php

namespace App\Http\Controllers;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use App\Http\Controllers\ChildController;

class ParentController extends Controller
{
    protected $ChildController;
    public function __construct(ChildController $ChildController)
    {
        $this->ChildController = $ChildController;
    }

    /**
     * Parent function using child function
     */
    function calc(Request $Request){

        $firstNumber = $Request->input('firstNumber');
        $operator = $Request->input('operator'); 
        $secondnumber = $Request->input('secondnumber');

        $response = $this->ChildController->Calculation($firstNumber, $operator, $secondnumber);
        return $response;
    }
}