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POLYNOMIAL FUNCTIONS A POLYNOMIAL is a monomial or a sum of monomials. A POLYNOMIAL IN ONE VARIABLE is a polynomial that contains only one variable. Example:

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Presentation on theme: "POLYNOMIAL FUNCTIONS A POLYNOMIAL is a monomial or a sum of monomials. A POLYNOMIAL IN ONE VARIABLE is a polynomial that contains only one variable. Example:"— Presentation transcript:

1 POLYNOMIAL FUNCTIONS A POLYNOMIAL is a monomial or a sum of monomials. A POLYNOMIAL IN ONE VARIABLE is a polynomial that contains only one variable. Example: 5x 2 + 3x - 7

2 POLYNOMIAL FUNCTIONS The DEGREE of a polynomial in one variable is the greatest exponent of its variable. A LEADING COEFFICIENT is the coefficient of the term with the highest degree. What is the degree and leading coefficient of 3x 5 – 3x + 2 ?

3 POLYNOMIAL FUNCTIONS A polynomial equation used to represent a function is called a POLYNOMIAL FUNCTION. Polynomial functions with a degree of 1 are called LINEAR POLYNOMIAL FUNCTIONS Polynomial functions with a degree of 2 are called QUADRATIC POLYNOMIAL FUNCTIONS Polynomial functions with a degree of 3 are called CUBIC POLYNOMIAL FUNCTIONS

4 POLYNOMIAL FUNCTIONS EVALUATING A POLYNOMIAL FUNCTION Find f(-2) if f(x) = 3x 2 – 2x – 6 f(-2) = 3(-2) 2 – 2(-2) – 6 f(-2) = – 6 f(-2) = 10

5 POLYNOMIAL FUNCTIONS EVALUATING A POLYNOMIAL FUNCTION Find f(2a) if f(x) = 3x 2 – 2x – 6 f(2a) = 3(2a) 2 – 2(2a) – 6 f(2a) = 12a 2 – 4a – 6

6 POLYNOMIAL FUNCTIONS EVALUATING A POLYNOMIAL FUNCTION Find f(m + 2) if f(x) = 3x 2 – 2x – 6 f(m + 2) = 3(m + 2) 2 – 2(m + 2) – 6 f(m + 2) = 3(m 2 + 4m + 4) – 2(m + 2) – 6 f(m + 2) = 3m m + 12 – 2m – 4 – 6 f(m + 2) = 3m m + 2

7 POLYNOMIAL FUNCTIONS EVALUATING A POLYNOMIAL FUNCTION Find 2g(-2a) if g(x) = 3x 2 – 2x – 6 2g(-2a) = 2[3(-2a) 2 – 2(-2a) – 6 ] 2g(-2a) = 2[12a 2 + 4a – 6] 2g(-2a) = 24a 2 + 8a – 12

8 POLYNOMIAL FUNCTIONS GENERAL SHAPES OF POLYNOMIAL FUNCTIONS f(x) = 3 Constant Function Degree = 0 Max. Zeros: 0

9 POLYNOMIAL FUNCTIONS GENERAL SHAPES OF POLYNOMIAL FUNCTIONS f(x) = x + 2 Linear Function Degree = 1 Max. Zeros: 1

10 POLYNOMIAL FUNCTIONS GENERAL SHAPES OF POLYNOMIAL FUNCTIONS f(x) = x 2 + 3x + 2 Quadratic Function Degree = 2 Max. Zeros: 2

11 POLYNOMIAL FUNCTIONS GENERAL SHAPES OF POLYNOMIAL FUNCTIONS f(x) = x 3 + 4x Cubic Function Degree = 3 Max. Zeros: 3

12 POLYNOMIAL FUNCTIONS GENERAL SHAPES OF POLYNOMIAL FUNCTIONS f(x) = x 4 + 4x 3 – 2x – 1 Quartic Function Degree = 4 Max. Zeros: 4

13 POLYNOMIAL FUNCTIONS GENERAL SHAPES OF POLYNOMIAL FUNCTIONS f(x) = x 5 + 4x 4 – 2x 3 – 4x 2 + x – 1 Quintic Function Degree = 5 Max. Zeros: 5

14 POLYNOMIAL FUNCTIONS END BEHAVIOR Degree: Even Leading Coefficient: + End Behavior: As x  -∞; f(x)  +∞ As x  +∞; f(x)  +∞ f(x) = x 2

15 POLYNOMIAL FUNCTIONS END BEHAVIOR Degree: Even Leading Coefficient: – End Behavior: As x  -∞; f(x)  -∞ As x  +∞; f(x)  -∞ f(x) = -x 2

16 POLYNOMIAL FUNCTIONS END BEHAVIOR Degree: Odd Leading Coefficient: + End Behavior: As x  -∞; f(x)  -∞ As x  +∞; f(x)  +∞ f(x) = x 3

17 POLYNOMIAL FUNCTIONS END BEHAVIOR Degree: Odd Leading Coefficient: – End Behavior: As x  -∞; f(x)  +∞ As x  +∞; f(x)  -∞ f(x) = -x 3

18 REMAINDER AND FACTOR THEOREMS f(x) = 2x 2 – 3x Divide the polynomial by x – 2 Find f(2) f(2) = 2(2) 2 – 3(2) + 4 f(2) = 8 – f(2) = 6

19 REMAINDER AND FACTOR THEOREMS f(x) = 3x 5 – 4x 3 + 5x - 3 Find f(-3) Try this one: Remember – Some terms are missing When synthetic division is used to evaluate a function, it is called SYNTHETIC SUBSTITUTION.

20 REMAINDER AND FACTOR THEOREMS The binomial x – a is a factor of the polynomial f(x) if and only if f(a) = 0. FACTOR THEOREM

21 REMAINDER AND FACTOR THEOREMS Is x – 2 a factor of x 3 – 3x 2 – 4x Yes, it is a factor, since f(2) = 0. Can you find the two remaining factors?

22 REMAINDER AND FACTOR THEOREMS (x + 3)( ? )( ? ) = x 3 – x 2 – 17x - 15 Find the two unknown ( ? ) quantities.


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