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mskyeg Group Title

What are the foci of the ellipse? Graph the ellipse. 18x^2 + 36y^2 = 648

  • one year ago
  • one year ago

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  1. mskyeg Group Title
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    • one year ago
  2. Mertsj Group Title
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    Get the equation into the right form by dividing both sides by 648

    • one year ago
  3. mskyeg Group Title
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    I did that im stuck at x^2/36 + y^2/18 = 1

    • one year ago
  4. Mertsj Group Title
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    Is the big number under the x or under the y?

    • one year ago
  5. mskyeg Group Title
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    x

    • one year ago
  6. Mertsj Group Title
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    That tells you that the major axis is horizontal so the vertices and foci are on the x axis and that a^2 = 36. Are you with me?

    • one year ago
  7. mskyeg Group Title
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    ya

    • one year ago
  8. mskyeg Group Title
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    b^2=18

    • one year ago
  9. Mertsj Group Title
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    Yep. So find c

    • one year ago
  10. mskyeg Group Title
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    how?

    • one year ago
  11. mskyeg Group Title
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    like wats the equation

    • one year ago
  12. Mertsj Group Title
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    do you mean "what is the question"?

    • one year ago
  13. mskyeg Group Title
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    i said equation

    • one year ago
  14. mskyeg Group Title
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    to find c

    • one year ago
  15. Mertsj Group Title
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    Do you mean what equation relates a, b, and c?

    • one year ago
  16. mskyeg Group Title
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    i guess ya

    • one year ago
  17. Mertsj Group Title
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    a^2-b^2=c^2

    • one year ago
  18. mskyeg Group Title
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    c=+/- 9?

    • one year ago
  19. mskyeg Group Title
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    not an option

    • one year ago
  20. Mertsj Group Title
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    |dw:1363368768837:dw|

    • one year ago
  21. Mertsj Group Title
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    What is c?

    • one year ago
  22. Mertsj Group Title
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    Can you find C or are we done???

    • one year ago
  23. mskyeg Group Title
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    found it thanx

    • one year ago
  24. Mertsj Group Title
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    What is it?

    • one year ago
  25. mskyeg Group Title
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    3 next to the square root of 2. dont knw how to write that in the chat box

    • one year ago
  26. Mertsj Group Title
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    3sqrt2 and -3sqrt2

    • one year ago
  27. mskyeg Group Title
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    ya

    • one year ago
  28. Mertsj Group Title
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    So the focal points are (3sqrt2,0) and (-3sqrt2,0)

    • one year ago
  29. mskyeg Group Title
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    ya

    • one year ago
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