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Techniques for Multiplying Polynomials




 
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More Lessons for Algebra

Math Worksheets

A series of free Basic Algebra Lessons.

In this lesson, we will learn

  • how to multiply monomials
  • how to multiply a monomial by a polynomial
  • how to multiply binomials using the FOIL method
  • how to multiply polynomials using the area model
  • how to multiply polynomials using the distributive property
  • how to multiply special cases polynomials


Multiplying Monomials and/or Binomials and FOIL

We multiply monomials and binomials using different methods, including the distributive property and FOIL. FOIL is a mnemonic device to remember how to find the product of two binomials: we multiply the First, Outer, Inner, and then Last terms in each binomial. When multiplying monomials and binomials, it is important to remember the rules of multiplying exponents.

Multiplying Monomials

When multiplying monomials: multiply the coefficients, and add the exponents for like factors only.

The following lesson looks at Multiplying Monomials



Multiplying monomials and polynomials

Multiplying a monomial by a polynomial combines several skills - all of which you have probably seen before: distributive multiplication, multiplying monomials, and combining like terms.

To multiply a monomial and a polynomial we can use the distributive and exponent properties.



 

Multiply Binomials using FOIL

The following looks at multiplying binomials (2 term polynomials). When multiplying binomials we use what we call the F.O.I.L Method. First, Outer, Inner, Last.

Step by step demonstration of multiplying two binomials.


Multiplying Polynomials using Area Models

Polynomials can be trickier than binomials when we multiply. Without FOIL, when multiplying polynomials we use different methods such as area models. Multiplying polynomials will be encountered often in Algebra II when solving equations. In order to understand multiplying polynomials, one must first understand multiplying monomials and binomials, and know the rules of multiplying exponents.

Multiplying Polynomials using Distributing

There are different methods for multiplying polynomials. One method is to use an area model, but another way to multiply polynomials without having to draw diagrams, is to multiply polynomials using distribution. In order to understand multiplying polynomials using distribution, we need knowledge of multiplying monomials and binomials and to know the rules of multiplying exponents.

Multiplication of Polynomials using the distributive property



Many examples of multiplying polynomials including binomial, trinomials, and squaring a binomial.

Multiplying Polynomials: Special Cases

When multiplying binomials and working with polynomials, sometimes we come up with polynomial special products. Examples of a special polynomial products include perfect square trinomials (a2 + 2ab + b2) and polynomials where the inner and outer terms are additive inverses and cancel each other out (a2 - b2). Knowing these types of special product patterns help us easily solve polynomial problems.

The following are special case examples of how to multiply binomials.

When we multiply conjugate pairs we get the difference of squares.
When we square binomials we get perfect square trinomials.


Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.


You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.


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