Method show does not work in laravel with resource controller

I have a little problem with the show method of my controller. What I want to do is show a single record, but I do not recognize the view to which I am pointing.

This is my method where I want to redirect my vision

public function show($id)
    {
        //
        $empresa = User::find($id);
        return view('welcome', ['empresa' => $empresa]);
    }

This is my route

Route::resource('/', 'Users\EmpresaController');

This is my view, where by clicking on the image or something should redirect me to my welcome view.

 @foreach($empresas as $empresa)
                <a href="{{url('/',array($empresa->id))}}">
                    <div class="col-md-4">
                        <div class="thumbnail">
                            <img src="{{asset('imagenes/empresas/'.$empresa->foto)}}" height="320" width="150" alt="">
                            <div class="caption">
                                <h4><a href="#">{{$empresa->name}}</a>
                                </h4>
                                <p>pagina web <a target="_blank" href="http://www.bootsnipp.com">www.ejemplo.com</a>.</p>
                            </div>
                            <div class="ratings">
                                <p class="pull-right">15 encuestas</p>
                                <p>
                                    <span class="glyphicon glyphicon-star"></span>
                                    <span class="glyphicon glyphicon-star"></span>
                                    <span class="glyphicon glyphicon-star"></span>
                                    <span class="glyphicon glyphicon-star"></span>
                                    <span class="glyphicon glyphicon-star"></span>
                                </p>
                            </div>
                        </div>
                    </div>
                </a>    
                @endforeach

and this is the message that comes out

Sorry, the page you are looking for could not be found

What is I doing wrong?