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# Warmup Alg 2 17 & 18 Apr 2012 - PowerPoint PPT Presentation

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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WarmupAlg 2 17 & 18 Apr 2012

• Don't forget about resources on mrwaddell.net

• Section 9.2: Parabolas again!

• Vertex

• Axis of symmetry

• Directrix

• Up, down, left and right

### Section 9.2: Graphing Parabolas

A function with a SINGLE “squared” term

• Parabola

• Focus

• Directrix

• Vertex

• Axis of symmetry

Axis of Symmetry

Focus

Distances are

the same!

Vertex

Directrix

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

The problem

Solve for x =

Find the value for “p”

Therefore “p” = 2

• “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 symmetry

The problem

Solve for y=

Find the value for “p”

Therefore “p” = 6

• “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!

• Section 9.2: 10 - 21