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A hyperbola centered at the origin has vertices at 
(0,+-sqrt19) and foci at 
(0,+-sqrt55).
Write the equation of this hyperbola.

A hyperbola centered at the origin has vertices at (0,±19) (0, \pm \sqrt{19}) and foci at (0,±55) (0, \pm \sqrt{55}) .\newlineWrite the equation of this hyperbola.

Full solution

Q. A hyperbola centered at the origin has vertices at (0,±19) (0, \pm \sqrt{19}) and foci at (0,±55) (0, \pm \sqrt{55}) .\newlineWrite the equation of this hyperbola.
  1. Identify standard form: Identify the standard form of the equation for a hyperbola with a vertical transverse axis.\newlineStandard form of equation for a hyperbola with a vertical transverse axis: \newline(yk)2/a2(xh)2/b2=1(y-k)^2/a^2 - (x-h)^2/b^2 = 1
  2. Determine center: Determine the values of hh and kk, which represent the center of the hyperbola. Since the hyperbola is centered at the origin, h=0h = 0 and k=0k = 0.
  3. Find semi-major axis: Find the value of the semi-major axis aa.aa is the distance from the center to a vertex along the y-axis. The vertices are given as (0,±19)(0, \pm\sqrt{19}), so a=19a = \sqrt{19}.
  4. Find semi-minor axis: Find the value of the semi-minor axis bb. The relationship between the semi-major axis aa, the semi-minor axis bb, and the distance cc from the center to a focus is c2=a2+b2c^2 = a^2 + b^2. The foci are given as (0,±55)(0, \pm\sqrt{55}), so c=55c = \sqrt{55}.
  5. Calculate value of b: Calculate the value of bb using the relationship c2=a2+b2c^2 = a^2 + b^2.
    c2=(55)2c^2 = (\sqrt{55})^2
    c2=55c^2 = 55
    a2=(19)2a^2 = (\sqrt{19})^2
    a2=19a^2 = 19
    b2=c2a2b^2 = c^2 - a^2
    b2=5519b^2 = 55 - 19
    b2=36b^2 = 36
    b=36b = \sqrt{36}
    c2=a2+b2c^2 = a^2 + b^200
  6. Write equation in standard form: Write the equation of the hyperbola in standard form after substituting the values of hh, kk, aa, and bb. Substitute values of hh, kk, aa, and bb into (yk)2/a2(xh)2/b2=1(y-k)^2/a^2 - (x-h)^2/b^2 = 1. (y0)2/192(x0)2/62=1(y - 0)^2/\sqrt{19}^2 - (x - 0)^2/6^2 = 1 kk00

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