### Theory:

Let us see the classification of multiplication of algebraic expression.
1. Multiplication of monomial with a monomial.
2. Multiplication of polynomial with a monomial.
3. Multiplication of binomial with a binomial.
4. Multiplication of polynomial with a polynomial.
Points to remember while doing multiplication of algebraic expression.
1. Look for the sign of the terms. That is, if both the terms have like signs ($$+,+$$) (or) ($$-,-$$) then the result will have $$+$$ sign. If both the terms have unlike signs ($$+,-$$) then the result will have a $$-ve$$ sign.
2. Multiply the corresponding coefficient of the terms.
3. Multiply the variables using the law of exponents.