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Help 3,4

NotSoSmart  Mar 20, 2018
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3.

 

Multiply both sides by -8

-8x  =  y^2

 

We have the form

 

4px  =  y^2     ⇒     -8  = 4p  ⇒     p  =  -2

 

The vertex of this parabola  is  (0,0)

The focus  is  ( 0 + p , 0 )   =   ( 0 - 2, 0 )  =  (-2, 0)

The directrix  is  x  =  2

 

Last answer

 

 

 

4.  Vertex  (0, 0 )    Focus  = (2.5, 0)

This parabola opens to the right

The form is

 

4px  = y^2

p  = 2.5   so

 

4 (2.5)x  = y^2

 

10x  =  y^2   divide both sides by 10

 

 

x  = (1/10) y^2

 

 

 

cool cool cool

CPhill  Mar 20, 2018

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