Understanding Polynomials: Degrees, Coefficients, and Graphs
Explore the essential concepts of polynomials, including degrees, coefficients, and graph shapes. Learn to identify leading coefficients, degrees, and relationships between polynomial functions and their graphs. Practice finding values of polynomials and analyzing the impact of degrees on the number of roots and graph shapes.
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POLYNOMIALS REVIEW The DEGREE of a polynomial is the largest degree of any single term in the polynomial (Polynomials are often written in descending order of the degree of its terms) COEFFICIENTS are the numerical value of each term in the polynomial The LEADING COEFFICIENT is the numerical value of the term with the HIGHEST DEGREE.
Polynomials Review Practice For each polynomial 1) Write the polynomial in descending order 2) Identify the DEGREE and LEADING COEFFICIENT of the polynomial + + + + 7 5 9 3 x x x x x 11 8 2 15 5 + + + + + + 8 6 4 2 x x x x 7 9 6 1 + + + + 2 4 3 x x x x 3 4 5 2 7 + + + + 5 4 2 x x x x 4 6 3 11 5
Finding values of a polynomial: Substitute values of x into polynomial and simplify: 6 4 ) ( + + = = x x x f __________ ) 2 ( = = f + + 5 4 2 x x 3 11 5 = = + + ) 1 3 2 f x x x ( x ( ) 5 f 12 6 Find each value for 1. 2. ) 3 ( f 3. 4. 2 1 ( f ) 2 f a 3 ( )
Graphs of Polynomial Functions: Constant Function (degree = 0) Linear Function (degree = 1) Quadratic Function (degree = 2) Cubic Function (deg. = 3) Quartic Function (deg. = 4) Quintic Function (deg. = 5)
OBSERVATIONS of Polynomial Graphs: 1) How does the degree of a polynomial function relate the number of roots of the graph? 2) Is there any relationship between the degree of the polynomial function and the shape of the graph?
OBSERVATIONS of Polynomial Graphs: 3) What additional information (value) related the degree of the polynomial may affect the shape of its graph? Describe possible shape of the following based on the degree and leading coefficient: 5 3 2 ) ( + + + + = = x x x f = = + + + + 5 3 g x x x x ( ) 3 7 4 1 4 2
Degree Practice with Polynomial Functions Identify the degree as odd or even and state the assumed degree. Identify leading coefficient as positive or negative.
Draw a graph for each descriptions: Description #1: Degree = 4 Leading Coefficient = 2 Leading Coefficient = -3 Description #3: Degree = 3 Leading Coefficient = 1 Description #2: Degree = 6 Description #5: Degree = 5 Leading Coefficient = -4 Description #4: Degree = 8 Leading Coefficient = -2
Graphs # 1 6 Identify RANGE:Interval or Inequality Notation Graph #1 Graph #2 Graph #3 (-2, 8) (0, 11) (13, 9) (1, 4) (7, -2) (-17, -10) (-6, -9) (-5, -9) (4, -15) Graph #6 Graph #5 (-5,17) Graph #4 (-3,12) (6, 11) (1, 12) (-3, 3) (4, 8) (2, 2) (-2, 6) (3, 2) (1, -3) (-5, -4) (1, -9) (4, -5)
The END BEHAVIOR of a polynomial describes the RANGE, f(x), as the DOMAIN, x, moves LEFT(as x approaches negative infinity: x - ) and RIGHT(as x approaches positive infinity : x ) on the graph. Determine the end behavior for each of the given graphs x x Right: Right: x x Left: Left:
Use Graphs #1 6 from the previous Slide Describe the END BEHAVIOR of each graph Identify if the degree is EVEN or ODD for the graph Identify if the leading coefficient is POSITIVE or NEGATIVE GRAPH #2 GRAPH #3 GRAPH #1 ) ( , f x x _____ x f x , ( ) _____ Degree: EVEN or ODD Leading Coefficient: POS or NEG GRAPH #4 GRAPH #6 GRAPH #5
Describing Polynomial Graphs Based on the Equation Based on the given polynomial function: Identify the Leading Coefficient and Degree. Sketch possible graph (Hint: How many direction changes possible?) Identify the END BEHAVIOR x x x x f 3 6 2 ) ( + + = = = = + + + + 4 2 5 3 h x x x x ( ) 2 1 = = + + + + 3 2 = = + + + + + + 6 4 2 p x x x x x ( ) 2 3 3 g x x x x ( ) 2 3 4
EXTREMA: MAXIMUM and MINIMUM points are the highest and lowest points on the graph. Point A is a Relative Maximumbecause it is the highest point in the immediate area (not the highest point on the entire graph). C A Point B is a Relative Minimumbecause it is the lowest point in the immediate area (not the lowest point on the entire graph). Point C is the Absolute Maximum because it is the highest point on the entire graph. B There is no Absolute Minimumon this graph because the end behavior is: ) ( , x f x x f x , ( ) (there is no bottom point)
Identify ALL Maximum or Minimum Points Distinguish if each is RELATIVE (R) or ABSOLUTE (A) Graph #1 Graph #2 Graph #3 (-2, 8) (0, 11) (13, 9) (1, 4) (7, -2) (-6, -9) (-5, -9) (-17, -10) (4, -15) Graph #6 Graph #5 Graph #4 (-3,12) (6, 11) (-2, 22) (-3, 3) (2, 2) (6, 3) (1, -3) (1, -9) (-5, -4) (4, -5)
CALCULATOR COMMANDS for POLYNOMIAL FUNCTIONS The WINDOW needs to be large enough to see graph! The ZEROES/ ROOTS of a polynomial function are the x-intercepts of the graph. Input [ Y=] as Y1 = function and Y2 = 0 [2nd ] [Calc] [Intersect] To find EXTEREMA(maximums and minimums): Input [ Y=] as Y1 = function [2nd ] [Calc] [3: Min] or [4: Max] LEFT and RIGHT bound tells the calculator where on the domain to search for the min or max. y-value of the point is the min/max value.
Using your calculator : Graph the each polynomial function and identify the ZEROES, EXTREMA, and END BEHAVIOR. [1] 11 8 3 ) ( + + + + = = x x x x f = = + + + + 3 2 g x x x x ( ) 2 6 4 1 4 3 [2] 1 = = + + + + 5 3 2 = = + + + + 4 3 2 y x x x x 3 2 8 y x x x x 8 5 1 [3] [4] 2
