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ADD AND SUBTRACT
POLYNOMIALS
Chapter 9 section 1
Polynomials
                       15x – x3 + 3
                     Is a polynomial

A polynomial is a monomial or a sum of monomials, each
called a term of the polynomial.

A polynomial can be named by its terms or its degree.
• A one term polynomial is called a monomial.
• A monomial is a number, a variable, or the product of a
 number and one or more variables with whole number
 exponents.

• A two term polynomial is called a binomial.
• A binomial is the sum or difference of two binomials.


• A three term polynomial is called a trinomial.
• A trinomial is the sum or difference of three binomials


• More than three terms is just called a polynomial.
Degree of a Polynomial
The degree of a polynomial is the greatest degree of its
terms.
            Leading coefficient

                     2x3 + x2 – 5x + 12

                    Degree        Constant term

When a polynomial is written so that the exponents of a
variable decrease from left to right.
Terms and Degrees
Is it a polynomial?
Classify by degree and number of terms.

• 15x – x3 + 3
•9
• 2x2 + x – 5
• 6n4 – 8n
• n-2 – 3
• 7bc3 + 4b4c
Addition and Subtraction
• Addition
• Combine like terms
• (2x3 – 5x2 + x) + ( 2x2 + x3 –1)
• (3x2 + x – 6) + (x2 + 4x + 10)


• Subtraction
• Add the opposite
• Combine like terms
• (4n2 + 5) – (-2n2 + 2n – 4)
• (4x2 – 3x + 5) – (3x2 – x – 8)
MULTIPLY AND DIVIDE
POLYNOMIALS
Chapter 9 section 2
Multiplying a monomial by a polynomial
• Use the distributive property.
• 2x3 (x3 + 3x2 – 2x + 5)




• x (7x2 + 4)




• 3x2 (2x3 – x2 + 4x – 3)
Multiplying a binomial by a binomial
• FOIL
• First times first
• Outer times outer
• Inner times inner
• Last times last


(x – 4) (3x + 2)
Multiplying a binomial by a binomial
• (3a + 4) ( a – 2)




• (4n – 1) (n + 5)
Multiplying a binomial by a trinomial
Use the box method
• (2x2 + 5x – 1) (4x – 3)


                   2x2      5x   -1

       4x

       -3



• Combine like terms
Multiplying Polynomials
• (x2 + 2x + 1) (x + 2)


• (3y2 – y + 5) (2y – 3)


• (2x2 – x -2) (3x – 1)
Homework
• Pages 557 – 558
      #11-25 odd,
• Pages 565 – 566
      #23 - 39 odd

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9.1 and 9.2

  • 2. Polynomials 15x – x3 + 3 Is a polynomial A polynomial is a monomial or a sum of monomials, each called a term of the polynomial. A polynomial can be named by its terms or its degree.
  • 3. • A one term polynomial is called a monomial. • A monomial is a number, a variable, or the product of a number and one or more variables with whole number exponents. • A two term polynomial is called a binomial. • A binomial is the sum or difference of two binomials. • A three term polynomial is called a trinomial. • A trinomial is the sum or difference of three binomials • More than three terms is just called a polynomial.
  • 4. Degree of a Polynomial The degree of a polynomial is the greatest degree of its terms. Leading coefficient 2x3 + x2 – 5x + 12 Degree Constant term When a polynomial is written so that the exponents of a variable decrease from left to right.
  • 5. Terms and Degrees Is it a polynomial? Classify by degree and number of terms. • 15x – x3 + 3 •9 • 2x2 + x – 5 • 6n4 – 8n • n-2 – 3 • 7bc3 + 4b4c
  • 6. Addition and Subtraction • Addition • Combine like terms • (2x3 – 5x2 + x) + ( 2x2 + x3 –1) • (3x2 + x – 6) + (x2 + 4x + 10) • Subtraction • Add the opposite • Combine like terms • (4n2 + 5) – (-2n2 + 2n – 4) • (4x2 – 3x + 5) – (3x2 – x – 8)
  • 8. Multiplying a monomial by a polynomial • Use the distributive property. • 2x3 (x3 + 3x2 – 2x + 5) • x (7x2 + 4) • 3x2 (2x3 – x2 + 4x – 3)
  • 9. Multiplying a binomial by a binomial • FOIL • First times first • Outer times outer • Inner times inner • Last times last (x – 4) (3x + 2)
  • 10. Multiplying a binomial by a binomial • (3a + 4) ( a – 2) • (4n – 1) (n + 5)
  • 11. Multiplying a binomial by a trinomial Use the box method • (2x2 + 5x – 1) (4x – 3) 2x2 5x -1 4x -3 • Combine like terms
  • 12. Multiplying Polynomials • (x2 + 2x + 1) (x + 2) • (3y2 – y + 5) (2y – 3) • (2x2 – x -2) (3x – 1)
  • 13. Homework • Pages 557 – 558 #11-25 odd, • Pages 565 – 566 #23 - 39 odd