1. Bellwork
1. Given the following function, a) determine the direction of its opening b) find the axis of symmetry c) the vertex
A track and field playing area is in the shape of a rectangle with semicircles
at each end. The inside perimeter of the track is to be 1500 meters. What should
be the dimensions of the rectangle so that the area of the rectangle is a maximum?

2. Pre-Calculus Honors Day 15
2.2 Polynomial Functions of High Degrees - How do you sketch graphs of polynomial function? -How to determine end behavior of graphs of polynomial functions? -How to find the zeros of polynomial functions?

3. Polynomial function of x with degree n…
Graphs of Polynomial Functions are continuous with no breaks, holes, or gaps.
The have smooth rounded turns with no sharp pointed turns.
Compare the following functions: Sort the functions by any method (s) you choose.
Even Functions: If n is even, the graph of y = xn touches the axis at the x-intercept.
Odd Functions: If n is odd, the graph of y = xn crosses the axis at the x-intercept.

4. The Leading Coefficient Test
When n is odd
If the leading coefficient is positive (an > 0), the graph falls to the left and rises to the right.
If the leading coefficient is negative (an < 0), the graph rises to the left and falls to the right.
When n is even
If the leading coefficient is positive (an > 0), the graph rises to the left and right.
If the leading coefficient is negative (an < 0), the graph falls to the left and right.

5. Example1: Use the leading coefficient test to determine the left and right behavior of the graph of each polynomial function.
Degree = 3 (odd), LC = negative
Rises to the left and falls to the right
Degree = 4 (even), LC = positive
Rises to the left and right
Degree = 5 (odd), LC = positive
Falls to the left and rises to the right

6. What’s going on in the middle?
USE THE ROOTS!
Single Root (x - c): simply crosses at x = c.
Double Root (x – c)2: graph touches but does not cross at x = c. Graph “bounces” at c.
Triple Root (x – c)3: graph will flatten at x = c as it passes the x-axis.

7. Example 2: sketch the graph using the leading coefficient test and the roots.
left rises, right rises, crosses at -4, flattens at -3
Left falls, right falls, bounces at -3
Left rises, right falls, crosses at -1
left rises, right falls, crosses at -3, -2, 1
Left rises, right rises, crosses at -1, 1, -3, 2
Left falls, right rises, crosses at 1, bounces at 3

8. Example 3: Find the real zeros and then graph.
Left falls, right falls
Crosses x-axis at 1, -1
Double root at x = 0 bounces
Left falls, right rises,
Crosses x-axis at 0, 2, -1

9. Example 3: Find the real zeros and then graph.
Left rises, right rises,
Crosses at 4/3, and
Flattens as it goes through 0.
Left rises, right falls,
Crosses at 0, bounces at 3/2

10. P. 156
20, 22, 31, 32, 56, 59, 72

11. Polynomial Art!
Graph a total of three polynomial functions (at least one even- and one odd-degree function) that you come up with yourself. Color each intersecting region differently so that no two bordering regions are colored alike. Write the equations of the functions on a key on the poster.
Title: %
At least three functions: 20% each = 60%
Neatness and Originality: 30%

18. Tonight's Homework
Pg 156 #19,21, 23, 27, 30, 34, 55, 57 Polynomial Art Due Next Friday 2/22