Download - Warmup Alg 2 17 & 18 Apr 2012
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Warmup Alg 2 17 & 18 Apr 2012
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Agenda• Don't forget about resources on
mrwaddell.net
• Section 9.2: Parabolas again!• Vertex• Axis of symmetry• Directrix• Up, down, left and right
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Go over assignment from last class period
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Section 9.2: Graphing Parabolas
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VocabularyParabola
Focus
Directrix
Vertex
Axis of symmetry
A function with a SINGLE “squared” term
Focus
Directrix
Vertex
Axis of Symmetry
Distances are the same!
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Quadratics
2
41 xp
y 2
41 xp
y
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Quadratics 2
2
41 yp
x 2
41 yp
x
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Practice – Graph & label the Focus, Directorix and axis of symmetry
28 yx 2
81 yx
The problem
Solve for x =
2
241 yx
Find the value for “p”
Therefore “p” = 2
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Now Graph it.“p” is 2, and what direction does it open?
It is an “x =“ so it opens left or right. Why?
2
241 yx
Vertex = (0,0)Focus = (2,0)
Directrix is x = -2
Graph the parabola in between!
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Practice – Graph & label the Focus, Directorix and axis of symmetry
yx 242
yx 2241
The problem
Solve for y=
yx
2
641Find the value for “p”
Therefore “p” = 6
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Now Graph it.“p” is 6, and what direction does it open?
It is an “y =“ so it opens up or down Why?
2
641 xy
Vertex = (0,0)Focus = (0,6)
Directrix is y = -6
Graph the parabola in between!
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Assignment
Section 9.2: 10 - 21