A25­2Notes.notebook
Algebra 2
Ch.5 Notes Page 17
February 02, 2015
Properties of Parabolas
Standard Form:
y = ax2 + bx + c
f(x) = ax2 + bx + c
P17 5­2 Properties of Parabolas
a > 0 Opens Up
a < 0 Opens Down
c = y­intercept (0, c)
Line of Symmetry
x = ­b
2a
Aug 19­6:20 AM
Sep 22­9:21 AM
Finding a Vertex (Max/Min)
Sketching the Parabola
y = x2 ­ 2x ­ 3
Up/Down
Use Line of Symmetry
and Substitution
y = 3x2 + 12x + 8
y­Intercept
Line of Symm
Is Vertex
a Max or Min?
Oct 8­7:09 AM
Vertex
Oct 8­7:09 AM
1
A25­2Notes.notebook
What if b = 0???
February 02, 2015
HW #17
5­1 P241 #1,5,8,10,11,13,18,20,21,38
5­2 P248 #1,8,10,17,22,23,29,31,37­39,44,54ab
Please put your name and class period at the top of the
homework. Also include the homework number.
Feb 25­10:29 AM
Aug 19­6:25 AM
Example: Word Problem
A company knows that sales can be modeled by ­5p + 100...
(where price is p.)
What price will maximize revenue?
What is the maximum revenue?
Revenue is the Product (Mult.) of Price and Sales.
r = p(­5p + 100)
Find the Vertex
Oct 8­8:35 AM
2