Conics Problem Part 2

  • Thread starter temaire
  • Start date
  • #1
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Homework Statement


This is the second page.
http://img116.imageshack.us/img116/7519/arch2iq9.jpg [Broken]​
[/URL]


Homework Equations


Formulas on picture above.


The Attempt at a Solution


I'am just wondering if everything looks fine.
 
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Answers and Replies

  • #2
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part (i) is correct.
For part (ii), I don't think that's how you would solve for b. There's a formula to solve for b. [tex]b^2=c^2-a^2[/tex] where c is your focii and a is the distance from your center (0,30) to the vertex of the hyperbola. a=10, c=30, then b=?
 
  • #3
238
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Whoops, I realized that the problem is using a different form of the vertical hyperbola instead of [tex]\frac{(y-k)^2}{a^2}-\frac{(x-h)^2}{b^2}=1[/tex], so in this case I switched a and b around.

In this problem, where b=10(the distance from center to vertex of hyperbola) is correct.
 

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