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Presentation transcript:

Copyright © 2014, 2010, 2007 Pearson Education, Inc. Chapter P Prerequisites: Fundamental Concepts of Algebra P.4 Polynomials Copyright © 2014, 2010, 2007 Pearson Education, Inc. 1

Objectives: Understand the vocabulary of polynomials. Add and subtract polynomials. Multiply polynomials. Use FOIL in polynomial multiplication. Use special products in polynomial multiplication. Perform operations with polynomials in several variables.

Definition of a Polynomial in x A polynomial in x is an algebraic expression of the form where an, an-1, an-2, ..., a1 and a0 are real numbers, and n is a nonnegative integer. The polynomial is of degree n, an is the leading coefficient, and a0 is the constant term.

Polynomials (continued) When a polynomial is in standard form, the terms are written in the order of descending powers of the variable. Thus, the notation that we use to describe a polynomial in x: Simplified polynomials with one, two, or three terms have special names: monomial (one term); binomial (two terms); trinomial (three terms). Simplified polynomials with four or more terms have no special names.

Adding and Subtracting Polynomials Polynomials are added and subtracted by combining like terms. Like terms are terms that have exactly the same variable factors.

Example: Adding and Subtracting Polynomials Perform the indicated operations and simplify:

Multiplying Polynomials The product of two monomials is obtained by using properties of exponents. We use the distributive property to multiply a monomial and a polynomial that is not a monomial. To multiply two polynomials when neither is a monomial, we multiply each term of one polynomial by each term of the other polynomial. Then combine like terms.

Example: Multiplying a Binomial and a Trinomial

The Product of Two Binomials: FOIL Any two binomials can be quickly multiplied by using the FOIL method: F represents the product of the first two terms in each binomial. O represents the product of the outside terms. I represents the product of the inside terms. L represents the product of the last, or second terms in each binomial.

Example: Using the FOIL Method Multiply: F O I L Product:

Special Products There are several products that occur so frequently that it’s convenient to memorize the form, or pattern, of these formulas. If A and B represent real numbers, variables, or algebraic expressions, then: Sum and Difference of Two Terms Squaring a Binomial

Example: Finding the Product of the Sum and Difference of Two Terms Multiply: We will use the special product formula A = 7x and B = 8, so A2 = (7x)2 and B2 = (8)2

Polynomials in Several Variables A polynomial in two variables, x and y, contains the sum of one or more monomials in the form axnym. The constant, a, is the coefficient. The exponents, n and m, represent whole numbers. The degree of the monomial axnym is n + m. The degree of a polynomial in two variables is the highest degree of all its terms.

Example: Subtracting Polynomials in Two Variables

Example: Multiplying Polynomials in Two Variables Each of the factors is a binomial, so we can apply the FOIL method for this multiplication. F O I L