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Help 27,28

NotSoSmart  May 15, 2018
 #1
avatar+91378 
+1

27.  9y^2 - 16x^2   = 144

 

Divide through by 144 to get to this form

 

y^2   -  x^2     = 1

___     ____

16         9

 

The center  is  (0, 0)

 

The  foci  are given  by

 

(0, ±√ [ 4^2 + 3^2 ] =

 

(0, ±√25 )  =

 

(0, ±5)

28.  The correct equation is

 

y^2    -  x^2    

___      ___  =    1

144       25

 

 

 

cool cool cool

CPhill  May 16, 2018

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