Warmup alg 2 17 18 apr 2012
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Warmup Alg 2 17 & 18 Apr 2012. Agenda. Don't forget about resources on mrwaddell.net Section 9.2: Parabolas again! Vertex Axis of symmetry Directrix Up, down, left and right. Go over assignment from last class period. Section 9.2: Graphing Parabolas. Vocabulary.

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Warmup Alg 2 17 & 18 Apr 2012

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Warmup alg 2 17 18 apr 2012

WarmupAlg 2 17 & 18 Apr 2012


Agenda

Agenda

  • Don't forget about resources on mrwaddell.net

  • Section 9.2: Parabolas again!

    • Vertex

    • Axis of symmetry

    • Directrix

    • Up, down, left and right


Go over assignment from last class period

Go over assignment from last class period


Section 9 2 graphing parabolas

Section 9.2: Graphing Parabolas


Vocabulary

Vocabulary

A function with a SINGLE “squared” term

  • Parabola

  • Focus

  • Directrix

  • Vertex

  • Axis of symmetry

Axis of Symmetry

Focus

Distances are

the same!

Vertex

Directrix


Quadratics

Quadratics


Quadratics 2

Quadratics 2


Practice graph label the focus directorix and axis of symmetry

Practice – Graph & label the Focus, Directorix and axis of symmetry

The problem

Solve for x =

Find the value for “p”

Therefore “p” = 2


Now graph it

Now Graph it.

  • “p” is 2, and what direction does it open?

It is an “x =“ so it opens left or right.

Why?

Vertex = (0,0)

Focus = (2,0)

Directrixis x = -2

Graph the parabola in between!


Practice graph label the focus directorix and axis of symmetry1

Practice – Graph & label the Focus, Directorix and axis of symmetry

The problem

Solve for y=

Find the value for “p”

Therefore “p” = 6


Now graph it1

Now Graph it.

  • “p” is 6, and what direction does it open?

It is an “y =“ so it opens up or down

Why?

Vertex = (0,0)

Focus = (0,6)

Directrixis y = -6

Graph the parabola in between!


Assignment

Assignment

  • Section 9.2:10 - 21


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