Route [admin/update] not defined in Laravel - laravel

Question

I am having trouble updating my data in Laravel and this is giving me headache. Every time i clicked on the update button error occurs.
Below is the error:
"Route [admin/update] not defined. (View: C:\xampp\htdocs\Tailor\core\resources\views\expensesCat\edit.blade.php)"
here is the edit.blade
<div class="portlet light bordered">
<h3 class="page-title">Expenses Categories</h3>
{!! Form::model($expenses_category, ['method' => 'POST', 'route' => ['admin/update', $expenses_category->id]]) !!}
<div class="panel panel-default">
<div class="panel-heading">
Edit
</div>
<div class="panel-body">
<div class="row">
<div class="col-xs-12 form-group">
<input name="order_create_by" type="hidden" value="{{ Auth::user()->id }}">
{!! Form::label('name', 'Name*', ['class' => 'control-label']) !!}
{!! Form::text('name', old('name'), ['class' => 'form-control', 'placeholder' => '']) !!}
<p class="help-block"></p>
#if($errors->has('name'))
<p class="help-block">
{{ $errors->first('name') }}
</p>
#endif
</div>
</div>
</div>
</div>
The web.php
Route::post('/update/{id}', 'ExpensesCategoriesController#updateCat');
The ExpensesCategoriesController
public function updateCat(UpdateExpensesCategoriesRequest $request, $id)
{
$expenses_category = ExpensesCategory::findOrFail($id);
$expenses_category->update($request->all());
return redirect('admin/expenses_categories');
}

Answer 1

Use url in your form -
{!! Form::model($expenses_category, ['method' => 'POST', 'url' =>'admin/update/'.$expenses_category->id]) !!}

Answer 2

You're trying to use the route by its name, but you didn't name it. So, change it to:
'route' => ['admin.update', ....
And name the route:
Route::post('/update/{id}', 'ExpensesCategoriesController#updateCat')->name('admin.update');
Or:
Route::post('/update/{id}', ['as' => 'admin.update', 'uses' => 'ExpensesCategoriesController#updateCat']);