How to modify request text in laravel

I can't think of a good title I'm so sorry but I need help.

I have a field that is added by jquery depending on how many questions are present in the database, so for example I have 3 questions in the db i will have 3 answer fields too, it will look like this:

answer_1 answer_2 answer_3

since i am not sure how many questions there can be, i need to loop the $request->answer_1, 2 and 3 in the controller to store the answers. but i'm not sure how to do it. I have tried:

for($i = 0; $i < total.count.of.answers; i++){
    $x = $i + 1;
    $answer = new Answer;
    $answer->answer = $request->answer_{$x};
    $answer->save();
}

but not working. How do I achieve this?

(note i can already send the answers to the backend using jquery, problem is only how i can pull it in the controller)

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