1. 10.5 Parabolas
Objective:
Use and determine the standard and general forms of the equations of a parabolas.
Graph parabolas.

3. below

5. Different than Textbook
Parabola Formula’s
Different than Textbook or or
Form of Equation
y = a(x – h)2 + k
x = a(y – k)2 + h
Axis of Symmetry
x = h
y = k
Vertex
(h, k)
Focus
ℎ, 𝑘+ 1 4𝑎
ℎ+ 1 4𝑎 , 𝑘
Directrix
𝑦=𝑘− 1 4𝑎
𝑥=ℎ− 1 4𝑎
Direction of Opening
up (a > 0); down (a < 0)
right (a > 0); left (a < 0)
Length of Latus Rectum
1 𝑎

10. Assignment 10.5 Practice Worksheet #1-5 (the LR on #5 is 8)
10.5 pg 659 #16, 18, 24, 26