Choose one of the problems and write a short letter to a friend giving him / her advice on that problem. Придумайте любую проблему и напишите короткое письмо другу, чтобы дать ему совет по этой проблеме. ​

I don't understand algebra well, I can't multiply a polynomial by a polynomial. To add a polynomial to a polynomial, you need to: multiply each monomial of the first polynomial by each monomial of the second polynomial;

add the resulting works (that is, write down one after another, taking into account the signs obtained during multiplication).