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mskyeg

  • one year ago

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

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

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

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

  5. mskyeg
    • one year ago
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    x

  6. Mertsj
    • one year ago
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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?

  7. mskyeg
    • one year ago
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    ya

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

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

  10. mskyeg
    • one year ago
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    how?

  11. mskyeg
    • one year ago
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    like wats the equation

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

  13. mskyeg
    • one year ago
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    i said equation

  14. mskyeg
    • one year ago
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    to find c

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

  16. mskyeg
    • one year ago
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    i guess ya

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

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

  19. mskyeg
    • one year ago
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    not an option

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

  21. Mertsj
    • one year ago
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    What is c?

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

  23. mskyeg
    • one year ago
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    found it thanx

  24. Mertsj
    • one year ago
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    What is it?

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

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

  27. mskyeg
    • one year ago
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    ya

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

  29. mskyeg
    • one year ago
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    ya

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