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Math Help - math 30 pure help please

  1. #1
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    math 30 pure help please

    can i please get some help in this one. trying to figure it out and i have atest tomm....
    Five of the six players on the receiving team must stand in an approximately elliptical arrangement, as shown in the diagram below.
    1. If point A is the origin of the coordinate axes, state the standard
    form equation

    for this ellipse.
    2. If point B is the origin of the coordinate axes, determine the generalform equation for the ellipsefor
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by mathproject View Post
    can i please get some help in this one. trying to figure it out and i have atest tomm....
    Five of the six players on the receiving team must stand in an approximately elliptical arrangement, as shown in the diagram below.
    1. If point A is the origin of the coordinate axes, state the standard
    form equation

    for this ellipse.
    2. If point B is the origin of the coordinate axes, determine the generalform equation for the ellipsefor
    see post #2 here, under the heading "Ellipse"

    of course, you are expected to know what phrases like "major axis", "minor axis" etc mean


    if you can find the center and the major and minor axis of the ellipse with respect to A and then B, then you are set

    can you continue?
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  3. #3
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    is it right?

    well here is the answer for A. i guess
    (x-3)^2/9 + 4(y-9/2)^2/81=1

    is it right?
    still strugling with the second part B
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  4. #4
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    That is correct for #1.

    Where is the center for #2?. It's at (-6,0) is it not?. But the lengths of the axes have not changed.
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  5. #5
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    i try to use(-6,0) but i get stuck wen it comes to 4(y-9/2)^2/81=1 . and then evrything is relly confusing for me. can some1 explain plz
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by mathproject View Post
    i try to use(-6,0) but i get stuck wen it comes to 4(y-9/2)^2/81=1 . and then evrything is relly confusing for me. can some1 explain plz
    if B is the origin, (-6,0) is the center. as before, the major axis is the vertical one, it is of length 9, and the minor axis is of length 6

    thus, we have

    (h,k) = (-6,0)
    a = 9/2
    b = 3

    now simply plug this into the form as the thread i directed you to directs

    we have:

    \frac {(x + 6)^2}{3^2} + \frac {y^2}{(9/2)^2} = 1
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  7. #7
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    Quote Originally Posted by Jhevon View Post
    if B is the origin, (-6,0) is the center. as before, the major axis is the vertical one, it is of length 9, and the minor axis is of length 6

    thus, we have

    (h,k) = (-6,0)
    a = 9/2
    b = 3

    now simply plug this into the form as the thread i directed you to directs

    we have:

    \frac {(x + 6)^2}{3^2} + \frac {y^2}{(9/2)^2} = 1

    ok i expanded the forms 9/2x^2+9y^2+54x+40.5y+12=0

    is this correct?
    Last edited by mr fantastic; January 16th 2009 at 10:00 PM. Reason: Removed language that had an insulting tone.
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  8. #8
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by mathproject View Post
    ok i expanded the forms 9/2x^2+9y^2+54x+40.5y+12=0

    well i suck at math. i think u should knoe that by now . so is this correct???
    no, that's not correct

    note that

    \frac {(x + 6)^2}9 + \frac {4y^2}{81} = 1 \implies 81(x + 6)^2 +  36y^2= 729 .........(i multiplied by 9(81))

    now i told you how to expand something like (x + 6)^2 already
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