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    Danne1's Avatar
    Danne1 Posts: 1, Reputation: 1
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    #1

    Dec 8, 2011, 08:20 AM
    How do I answer these 2 math exercises?
    First exercise
    Finding the foci and vertice of (Y-2)² = 4(X-3)


    Second exercise:
    Equation of hyperbola F(± 4, 0) and K= 6

    I would deeply appreciate any quick prompt answer. Thanks.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Dec 8, 2011, 02:02 PM
    Quote Originally Posted by Danne1 View Post
    First exercise
    Finding the foci and vertice of (Y-2)² = 4(X-3)
    Note that you can't cut and paste math symbols from other applications into the question box because it becomes unreadable. But if you mean this:

    (y-2)^2 = 4(x-3)

    you have a parabola that is laying on its side. The general form for the parabola is 4p(x-x1) = (y-y1)^2 where (x1,y1) is the vertex and 'p' is the distance between focus and vertex. So here p = 1; can you finish it from here?


    Quote Originally Posted by Danne1 View Post
    Second exercise:
    Equation of hyperbola F(± 4, 0) and K= 6.
    I assume that you mean is the foci are at (4,0) and (-4, 0). From this you know that c = 4 (distance from the center to either focus). Not sure what "k" means, but if you mean eccectricity (e) then since c = ae that tells you that the value for 'a' is 4/6 = 2/3. The value for b can be found from c = sqrt(a^2+b^2).

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